Bukayo Saka is set for a spell on the sidelines in what is a significant blow for Arsenal.
Speaking at a press conference on Friday afternoon ahead of Arsenal's match at home to Everton, Arteta did not put a firm timeframe on Saka’s return, but there are fears that he will be out for eight weeks.
"We need a few more scans and opinions from the specialists. When a player is struggling to walk without any pain, he's restricted in movement, they are not good signs. Let's be a little bit patient so we can gave a definitive assessment."
Bukayo Saka was forced off after 10 minutes against Bayern Munich
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With Christos Tzolis still out with a hamstring injury and Arsenal already short of options on the wing, it leaves Arteta with a headache in what is a hectic run of fixtures.
The Gunners have five more matches to play before the November international break, including a trip to Anfield to face Liverpool.
However, if the eight-week timeline is accurate then Saka will not be back before Christmas, thus missing games against Borussia Dortmund, Manchester City, Tottenham and Real Madrid, potentially returning against Manchester United on December 20.
Arsenal fixtures Saka could miss:
Everton (H) - October 24
Fleetwood (A) - October 27
Liverpool (A) - November 1
Slavia Prague (A) - November 4
Hull (H) - November 7
Newcastle (A) - November 21
Borussia Dortmund (H) - November 24
Man City (H) - November 29
Brentford (A) - December 2
Tottenham (A) - December 6
Real Madrid (H) - December 9
Bournemouth (H) - December 13
Manchester United (H) - December 20