Liverpool and England striker Daniel Sturridge is a doubt for the European Championship qualifier against Switzerland on Monday after withdrawing from training on Friday.
Sturridge will undergo a scan and will be assessed by England's medical staff before a decision is made over his fitness prior to the trip to Basel.
The 25 year old played 89 minutes of England's 1-0 friendly win over Norway before being replaced by Rickie Lambert.
Should the Liverpool forward miss the game against Switzerland, his fragile injury history would make him a doubt for resumption of his club's domestic campaign against Aston Villa on 13 September.
A statement from The FA read: "Daniel Sturridge felt an injury in training this morning and will go for a scan this afternoon. He will then be assessed by England medics."
Sturridge's campaign for Liverpool was disrupted by a series of hamstring injuries last term and England will hope a similar problem hasn't befallen him.
On the Liverpool player's fitnes, defender Gary Cahill said: "I saw him go for the scan but I know nothing about that yet. We have our fingers crossed because he's a key player for club and country. He has been fantastic of late and he's a big player."
Danny Welbeck would be expected to replace Sturridge should he fail to prove his fitness ahead of the Euro 2016 qualifying opener after impressing during a 20-minute cameo against Norway on Wednesday.
England manager Roy Hodgson said: "When Danny came on we were already leading by one goal to nil," explained Hodgson. "In the first half we are playing a team who are not making too many attempts to attack us.
"It is not always right to compare performances in the first 20-25 minutes, with performances in the last 25 minutes.
"I am happy with Danny Welbeck, I did think he was very lively when he came on," he added.
"I do think that when Sterling looked good when he moved into the centre he showed the full range of his dribbling ability. It's nice to know that we have these options and we are not totally restricted to one-way play."