England manager Gareth Southgate's plans for Euro 2020 have been rocked by the news Mason Mount and Ben Chilwell have to self-isolate.
The Scotland FA announced earlier that Billy Gilmour must quarantine for 10 days after testing positive for Covid following the draw against England on Friday night.
Gilmour's Chelsea colleagues Mount, who played the entire 90 minutes of the Wembley clash, and Chilwell, who was an unused substitute, were photographed standing next to the Scot after the game.
And the England pair are now required to self-isolate, which could prevent them from participating in tomorrow's final group game versus Czech Republic.
They could also be forced to miss the start of the knockout stages which start next week. It is understood Public Health England have been in contact with the FA over the issue.
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 tomorrow.
But the latest news is a tough pill for England boss Southgate to swallow as he readies his side for tomorrow night's final Group D clash against the Czechs.
Mount has been a key part of Southgate's team so far, with the Champions League-winning Chelsea attacking midfielder having started the win against Croatia and the draw versus Scotland.
Chilwell, however, has not yet featured on the pitch, with Kieran Trippier and Luke Shaw preferred at left back in the first two games.
With the last-16 starting on Saturday and ending next Tuesday, Mount and Chilwell are also in danger of missing the start of the knockout-phase, should they have to self-isolate for 10 days.
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.