Arsenal manager Mikel Arteta hopes England's second-half substitution of Bukayo Saka was nothing more than a precaution.
Saka limped off the field in the 51st minute of the Three Lions' clash against Greece and was replaced by Noni Madueke.
The Arsenal winger started the Three Lions match.
Saka's substitution came immediately after Greece took a surprising lead thanks to a confident finish from Vangelis Pavlidis following poor defending from England.
The 23-year-old appeared to be clutching his right hamstring as he walked off the field with two members of England's medical staff at his side.
If Saka were to miss out, it would be the second consecutive international window in which an Arsenal star has been injured.
Gunners pattern Martin Odegaard suffered an ankle injury while playing for Norway during the last break.
He has missed the last seven games for Arsenal but was recently filmed running on tape, raising hope among fans that his return is imminent.
summer recruit Riccardo Calafiori suffered a calf injury in Italy's match against France at the last break, but only missed the north London derby.
Saka has been an ever-present for Arsenal this season and has started every game in all competitions.
The 23-year-old has also been in good form for the Gunners, registering seven Premier League assists in as many games.
He produced a man-of-the-match performance in Arsenal's final match before the international break as Arteta's side came from behind to beat Southampton 3-1.
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Saka was involved in all three of Arsenal's goals, scoring one and assisting two others, and the victory ensured the Gunners went into the break in third place in the standings with 17 points.
He only missed two league games last season due to injury, although Arsenal managed to win both, one of which was a brave 1-0 victory over Manchester City.
