Kai Havertz will miss a period of time with a knee injury. Havertz missed Wednesday\'s open training session at Emirates Stadium on Wednesday.
If Havertz misses an extended window, his absence will mean only Viktor Gyökeres is Arsenal\'s only true center-forward. Arsenal could evaluate transfer market options to help offset the loss of Havertz.
Havertz played the final 30 minutes of Arsenal\'s 1-0 win at Manchester United on Sunday to open the Premier League season.