The Czech Republic international had been absent but will join back up with the Gunners squad ahead of Saturday's match against Newcastle at St James' Park.
That's good news for Wenger, who admits he will need to assess the fatigue levels in his team after their mammoth effort against Monaco in the Champions League in midweek.
Thankfully Arsenal have no new injury worries heading into the match at Newcastle, which means the likes of Aaron Ramsey and Theo Walcott, who came off the bench in Monaco, will be in contention to start should Wenger rotate.
As was already the case, the Arsenal boss will be without Mike Arteta, Jack Wilshere and Mathieu Debuchy - all three have ankle injuries - and Alex Oxlade Chamberlain, who strained his hamstring against Manchester United in the FA Cup.
Ramsey thinks team chemistry key
Aaron Ramsey has put Arsenal's strong upsurge in form down to the team's chemistry. Arsenal have won 13 of their last 15 matches in all competitions, and will look to put more pressure on their Champions League qualifications rivals by taking three points from Newcastle this weekend.
And Ramsey thinks the team dynamic is positive, which leads to good performances on the pitch.
"It's good - I'm happy," Ramsey told Arsenal Player. "I have been disappointed with the number of injuries I've had this year - it is always difficult when you are in a stop-start scenario but I'm feeling good and hopefully I can stay injury-free for the rest of the season.
"We have a good group here, everyone gets on and we are quite positive no matter what happens during the season."
Walcott contract talks
Theo Walcott has put off contract talks until the end of the season amid interest from Liverpool.
Both Arsenal and Walcott are reportedly happy to shelve negotiations for the time being, with the England international out of contract at the end of next season.
He remains 'fully committed' to Arsenal but talks have been dragging on, leading to speculation that Liverpool may test the water with a bid in the summer.