Understandably, Arsene Wenger is not best pleased with the news that star full-back Hector Bellerin has been ruled out for the next four weeks.
The Spaniard was withdrawn from international duty and sent back to London for further investigation into the ankle knock, which it has since transpired that he picked up during the north London derby against Spurs at the start of the month.
And in typical Wenger style, he knows exactly where, or in this case who, to point the finger of blame at.
Bellerin has been in flying form once again this term, featuring in all 11 of the club's league games, but this setback now means that he'll miss some crucial encounters, starting this weekend against Manchester United.
And following that he will be forced to sit out of the Champions League group decider against Ligue 1 champions Paris Saint-Germain just days later.
Other games he'll be forced to miss include the meeting with Basel on 6 December, as well as the EFL quarter-final against Southampton at Emirates Stadium on 30 November.
However, Wenger has one player squarely responsible for the injury to Bellerin, and that's Tottenham defender Danny Rose.
"He got injured in the last 10 seconds in a very strong tackle from Danny Rose," Wenger said via the BBC.
Arsenal currently lie fourth in the Premier League table, and will be hoping to put more daylight between themselves and United this weekend, especially as the Red Devils have been unable to click out of second gear yet.
However, the Gunners have a patchy record at Old Trafford, but given United's recent struggles Wenger will be feeling confident of coming away with something from the lunchtime kick off.
Wenger will also be sweating on the fitness of star man Alexis Sanchez ahead of the game, too.
The Chilean starred for his country during their 3-1 victory over Uruguay earlier this week despite concerns that he was carrying a thigh injury, and though he came through the game unscathed, he will face a late fitness test on Friday.