According to the Daily Mail, Borussia Dortmund defender Mats Hummels is Arsenal's top transfer target this January, but he could cost the club as much as £32 million.
Arsene Wenger’s promise to bolster Arsenal's squad in the upcoming transfer window will be put to the test over the upcoming window, although the Gunners will face a considerable battle with Manchester United, who led a summer-long chase for his signature.
After spending just above £50m on attacking players Alexis Sanchez and Danny Welbeck during the summer transfer window, Wenger is making the club's back-four his priority in the New Year.
The Gunners' weak defence was exposed yesterday against Hull City with Laurent Koscielny, Calum Chambers and Mathieu Debuchy ruled out of action. The French boss was forced to partner Per Mertesacker with left-back Nacho Monreal, while youngster Hector Bellerin was handed a start at right-back.