England manager Gareth Southgate's European Championship plans were in disarray on Monday night after Mason Mount and Ben Chilwell were forced to self-isolate following a tunnel rendezvous with Billy Gilmour.

The Scotland Football Association announced on Monday morning that Gilmour had entered a 10-day quarantine after testing positive for Covid following the draw against England at Wembley on Friday night.

The midfielder's Chelsea colleagues Mount, who played the entire 90 minutes, and Chilwell, who was an unused substitute, were photographed standing next to the Scot after the game.

But Southgate revealed that his two players also met up with Gilmour in the tunnel area after the game - which could be in breach Covid protocols.

The England pair were self-isolating on Monday night, throwing their involvement for Tuesday night's clash with Czech Republic in serious doubt - though Southgate refused to rule them during his pre-match briefing.

The issue could even put at risk Mount and Chilwell's availability for the start of the knockout stages next week if they are required to isolate for 10 days.

As a precaution at this time and in consultation with Public Health England [PHE], Ben Chilwell and Mason Mount are isolating after interaction with Scotland player Billy Gilmour at Friday's match.

The pair will be kept away from the rest of the England players and wider support team, pending further discussions with PHE.

The entire squad had lateral flow tests on Monday afternoon and all were again negative, as was the case with Sunday's UEFA pre-match PCR tests.

We will continue to follow all Covid-19 protocols and the UEFA testing regime, while remaining in close contact with PHE.

England staff are locked in talks with Public Health England trying to ascertain when the duo could rejoin the squad.

England players underwent extra testing on Monday, with all of them returning negative tests.

Nevertheless, the news came as a major headache to Southgate, although his side's passage into the last 16 was booked after Ukraine and Finland both finished third in their groups with three points.

'I don't want to cause a drama for Scotland but if you're all in the dressing room together where does everything stand?,' said Southgate, appearing to question the Covid guidelines.

'I don't know is the honest answer to that. Our medical people are dealing with all of this,' said the England boss.

'I was on the training pitch when I found out, so we'd just literally finished training.

'In terms of the team, we'll need to go through details with the players in the morning really, so we'll have to know by first thing in the morning of their availability and if not we'll just have to play on without them.'

Depending on whether Mount and Chilwell are available, Southgate is not likely to make wholesale changes from the team that started against the Scots.

The England boss was set to choose the same midfield three as he did against Croatia and Scotland, but Jude Bellingham could get his first start of the tournament in place of Mount.

Harry Maguire is pushing for his first appearance since damaging ankle ligaments on May 9. Southgate is planning on giving the Manchester United captain some minutes - but has been contemplating giving his first choice centre-back a start.

(4-3-3): Pickford; Walker, Stones, Maguire, Shaw; Phillips, Rice, Bellingham; Foden, Kane, Sterling.

Kyle Walker is set to replace Reece James at right-back; while Luke Shaw is hopeful of keeping his place, particularly if Chilwell, who was in contention to feature, isn't available.

In a statement released on Monday afternoon, the FA said: 'As a precaution at this time and in consultation with Public Health England [PHE], Ben Chilwell and Mason Mount are isolating after interaction with Scotland player Billy Gilmour at Friday's match.

'The pair will be kept away from the rest of the England players and wider support team, pending further discussions with PHE.

'The entire squad had lateral flow tests on Monday afternoon and all were again negative, as was the case with Sunday's UEFA pre-match PCR tests.

'We will continue to follow all Covid-19 protocols and the UEFA testing regime, while remaining in close contact with PHE.'

The news does come after all 26 players of Southgate's England squad trained together on Monday after each returned negative Covid-19 tests.

Similarly, the 25 remaining players in the Scotland squad were not deemed close contacts with Gilmour and therefore also all trained together on Monday, after returning negative lateral-flow tests.

Scotland captain Andy Robertson, earlier on Monday, deleted a video of himself playing table tennis with Glimour and John McGinn.

Soon after news broke of Gilmour's positive test on Monday morning, a clip surfaced from the team hotel where the young midfielder is seen enjoying some ping-pong.

Taken on Robertson's Instagram story, the video shows Gilmour, along with McGinn, unwinding with a game in the team hotel.

The video has since been removed from the Liverpool full-back's Instagram account, with man-of-the-match from Friday night Gilmour definitely out of the Scots' do-or-die encounter against Croatia at Hampden Park.

Gilmour's positive test is the second to hit the Scotland camp since the squad met up earlier this month.

Sheffield United midfielder John Fleck sat out both of the Scots' warm-up fixtures against Holland and Luxembourg after contracting the virus.

Meanwhile, fans took to Twitter to react to the news that England's players would not receive extra testing despite being on the same pitch as Gilmour on Friday night.

Twitter user Stuart Graham said: 'So I'm really confused, if a pupil in my daughters class 'bubble' tests positive for Covid then the whole class will isolate, yet Billy Gilmour tests positive yet Scottish team don't have to self-isolate.'

Another tweeted: 'I'm honestly baffled with this Covid-19 nonsense, how can they say no one is considered as a close contact to Billy Gilmour when all the players shared the same dressing room etc - totally f***ed up.'

And a third added: 'So Billy Gilmour has to isolate but the entire team, whom he has been in very close contact with, don't. Yeah, right, that makes perfect sense. If a kid in class tests positive the whole class are sent home. Get an effin grip. It's all utter nonsense.'

All Euro 2020 teams are living in a bubble and avoiding all contact with the public for the duration of their involvement in the tournament. Players are having regular PCR tests - with everyone getting tested 48 hours before every match as per UEFA regulations - and their temperatures are taken when they arrive at stadiums.

Any player, coach or official who returns a positive result is immediately removed from the group and quarantined, followed by universal testing of the entire squad and any known contacts.

Opposition players are not deemed close contacts unless they spend an extended period of time with the positive player - which Chilwell and Mount were with Gilmour on Friday night.

Guidance from England's FA states match play is not considered 'close contact' so no action is needed unless individuals experience symptoms, in which case they must self-isolate from that point as per Government guidance.