Arsenal could be without centre - back Per Mertesacker , who has been suffering with an illness .
Wenger confirmed there were no new injuries and Zagreb absentees Aaron Ramsey and Hector Bellerin are set to return to the squad .
Arsenal could be without centre - back Per Mertesacker , who has been suffering with an illness , although Wenger confirmed there were no new injuries and Zagreb absentees Aaron Ramsey and Hector Bellerin are set to return to the squad .