The former Barcelona star suffered a groin problem during the win over Manchester United.
French boss says signing was a gamble that has certainly paid off.
The Spain international has scored five goals in seven La Liga games.
The club are looking for a versatile forward to fill the gap left by the departure of Pedro to Chelsea.
Iwobi tasted first team football for the Gunners during their pre-season campaign.
Sanchez took his season tally to six against Manchester United after Copa America exploits.
Iwobi is already in talks with interested clubs.
Vela earned €12m out of the striker two years ago and now he wants a move to the MLS.
The French boss praises his side's response to beating Manchester United 3-0.
England international was involved in two goals but failed to find the net.
The Gunners stunned United with three goals in the opening 20 minutes to secure the three points.
Live coverage from The Emirates Stadium as Arsenal host Manchester United.
The Spanish international is reportedly likely to make a move to a bigger club.
French boss threatens to halt briefing after questions regarding his long-time rival.
Defender says he is ready to regain a starting place in Louis van Gaal line-up.
A rotated squad is an option in the match against Arsene Wenger's outfit.
Defender unlikely to feature in the upcoming game against Manchester United.
Wenger trust in the young was a key reason for joining Gunners says England international.
Club legend also says Wenger made a 'big mistake' by handing Ospina the number one shirt.
The Brazil defender says the Gunners only have themselves to blame for European loss.
Arsene Wenger's side still have hope despite losing their first two group matches in Europe.
The Spaniard beat Debuchy in the battle for the right-back slot after an impressive season last term.