Arsene Wenger suggested Cazorla had suffered an achillies injury in recovery from knee surgery.
Arsenal lost 3-2 to Manchester United in the Premier League on Sunday (28 February) to put a dent in their title hopes.
Santi Cazorla could be facing the prospect of missing the rest of the season with an Achilles injury.
Wenger said he wants his players to respond to losing to Barcelona and Manchester United.
Key attacking pair are contracted until 2018, although nothing appears imminent in terms of extensions.
Kelechi Nwakali has completed his move to Arsenal after agreeing a five-year deal which will begin in the summer.
The 22-year-old's Euro 2016 ambitions remain intact after Arsene Wenger provides latest fitness update.
Ray Parlour believes Arsenal do not have the desire and grit to win the Premier League title.
The 47-year-old pundit has hit out at the French manager and his lack of spending.
The Gunners boss insists his side have the character to bounce back from defeat to United.
Arsenal will take on Manchester United at Old Trafford in a do-or-die match. Find out where to watch in the UK.
Arsene Wenger is confident that the Gunners will not scupper their title hopes like previous seasons.
Arsenal are sending scouts to watch Bazoer play every match.
Gabriel suffered a muscle injury during a training session ahead of Arsenal's 2-1 win over Leicester City.
Arsenal have scored just four goals in their last seven clashes in all competitions causing concern for Wenger.
Danny Welbeck is yet to start a game for Arsenal following his return from injury.
Alex Oxlade-Chamberlain is facing a two-month spell on the sidelines after suffering a knee injury during Arsenal's loss against Barcelona.
The Gunners however do boast cash reserves of £135.9m.
French boss says that Gabriel Paulista is still doubt for the trip to Old Trafford.
Alexis Sanchez has scored only one goal in 2016, which was during Arsenal's 2-1 victory over Burnley in the FA Cup.
Arsene Wenger will look to bolster his strike force, who have struggled to score goals this season.
Hector Bellerin's rise saw Mathieu Debuchy leave Arsenal temporarily on loan in the January transfer window.