Marcus Rashford and Jesse Lingard are in danger of missing the start of pre-season training with Manchester United - after jetting off for a short holiday in Greece.
The England stars flew out for a well-deserved summer break this week following the Red Devils' Europa League semi-final defeat by Sevilla on Sunday.
But there is now a risk that Greece could be added to the UK Government's list of countries which would require a two-week quarantine.
It is expected that Greece will be added to the list after recording 250 new coronavirus infections on Tuesday, which would mean travellers arriving back to the UK will have to undergo a period of self-isolation.
And as reported by the Daily Mail, Rashford and Lingard are now facing an anxious wait to discover if they will have to cut short their holiday.
The pair were given manager Ole Gunnar Solskjaer's blessing to go on holiday, but on the condition that they would be available for the start of pre-season training on September 1
If the Government do indeed add Greece to their quarantine list as expected, it would mean Rashford and Lingard would face a dash to return home before the rules come into operation on Saturday.
Meanwhile, it emerged on Wednesday that the Premier League has been hit by 14 new coronavirus cases from 12 different clubs as stars return for pre-season training.
As reports The Telegraph there are concerns that the positive tests have come from players returning from holidays abroad.
Liverpool were one of the sides believed to have recorded one positive test after they landed at their pre-season training camp in Austria on Saturday.
Eight clubs are still yet to return to training, with Man City, Man Utd, Chelsea and Wolves among them due to their European commitments.
Arsenal, Fulham, Burnley and West Brom have also not reported back yet.
Meanwhile Tottenham, Everton, Southampton, West Ham, Crystal Palace, Leicester, Newcastle, Sheffield United and Leeds have all returned.
Aston Villa and Brighton are the only two sides remaining but it is not known whether either has started their pre-season scheduling.
The positive cases have not been confirmed by the Premier League and it is expected that they will only release official figures once the 2020/21 campaign kicks off again.