Manchester United midfielder Darren Fletcher sat out of Scotland training on Monday as a precaution after complaining of "not feeling 100 per cent", but could still captain his country in tonight's international friendly match against England.
Gordon Strachan's side welcome the Three Lions to Celtic Park on Tuesday evening for what is sure to be a fiercely competitive encounter given the rivalry between the two home nations.
The Scots will be looking to maintain their winning run after recording an impressive 1-0 victory over the Republic of Ireland at the weekend, while Roy Hodgson's men come into the game off the back of a 3-1 win over Slovenia at Wembley on Saturday.
England have a 100 per cent record in Euro 2016 qualifying Group E, and so arrive north of the border in confident mood ahead of the game.
Both managers are expected to use the fixture as an opportunity to experiment with some of their fringe players, but that is unlikely to take away from the excitement and atmosphere that is expected at Parkhead.
Speaking to reporters at Monday's pre-match press conference, Strachan talked up his desire to win the game, and also confirmed the return of injured midfielder James Morrison who - unlike Fletcher - trained with the squad.
"I would love to give everybody the experience of playing the game, one way or another, but I've got to balance it with wanting to win it," he was quoted saying by BBC Sport. "We want to compete and make it as difficult for the other team as possible.
"Darren is not feeling at his best today but he'll be fine" - Gordon Strachan
"England have got terrific players. They were comfortable winners against Slovenia. They could have stepped up any time they felt like it."
Strachan added: "Darren is not feeling at his best today but he'll be fine, he'll be training tomorrow."
Manchester United fans will be watching closely if Fletcher does indeed recover in time for Tuesday's clash, particularly as Louis van Gaal has already been dealt injury blows to David De Gea and Daley Blind during this international break.
The Spanish goalkeeper dislocated a finger during training with Vicente del Bosque's squad on Friday, while the former Ajax midfielder injured his knee during the Netherlands' 6-0 victory over Latvia on Sunday.
Injury problems at Old Trafford
And with an important Premier League clash against Arsenal at the Emirates Stadium next Saturday, the Red Devils boss won't want any more setbacks between now and his first-team stars returning to Manchester in the next few days.
Although Fletcher hasn't played a lot of football under Van Gaal this season, he was named vice-captain behind Wayne Rooney for the 2014/15 campaign, so his influence around the dressing room would be missed if he returns to Carrington unfit after being risked for the England friendly.