Per Mertesacker's knee injury has given Arsene Wenger a severe headache with the new season rapidly approaching.
The knock he picked up against Lens on Friday has turned out to be far more serious than Arsenal's medical staff first thought and the German has already been ruled out for 'months' after surgery.
For Wenger, it has forced him into a very uncomfortable position with just a few centre-back options currently available.
Although Arsenal's primary target for this summer has been signing a new striker, the Gunners boss has admitted they are now in the market for another defender.
The north London side are preparing for the first game of their brief two-match tour of America against the MLS All-Stars and Wenger will be relying on an inexperienced centre-back pairing to go through the voyage unscathed.
Laurent Koscielny has been given an extended holiday after reaching the Euro 2016 final while Gabriel has been suffering from illness so also missed the cut from Wenger's squad to cross the Atlantic.
Mertesacker's injury means Calum Chambers and new boy Rob Holding are the only centre-backs from the senior squad fit enough to play.
Neither Chambers or Holding would be considered Arsenal's first choice duo once the season starts and Wenger has provided an update on their transfer targets.
Speaking to the press ahead of the Gunners clash against a side including Didier Drogba, David Villa and Andrea Pirlo, Wenger said: "We have to look for an option to get a bit more experience. We will see some of our young centre backs on Thursday as well.
"We will see some of our young centre backs on Thursday as well. With Per being out, we are a bit short on the experience front and we are looking to bring somebody in."
Wenger will be cursing his luck this summer after Jamie Vardy snubbed an offer to move to the Emirates and the news that broke yesterday regarding his failed attempts to sign Alexandre Lacazette.
Ideally, he would have liked to put all of the club's efforts into finding a new frontman but Mertesacker's injury has certainly disrupted their plans.