#3 Kim Kallstrom
Already 31-years-old when signed by the north Londoners, Kim Kallstrom was a January capture in 2014, out of character for Wenger who generally liked to do his transfer business in the summer window.
Jack Wilshere was injured – what’s new – and some cover was required, but Kallstrom himself was injured. A back problem meant that he wasn’t able to play immediately upon signing and so the move made little sense, however as Wenger saw it, it was an extra body for the gruelling Premier League run in.
That it took six weeks for the Swede to overcome his problem is unlikely to have been a scenario that the Frenchman had contemplated, and media at the time had a field day.
Even worse was to follow, Kallstrom only made a measly four appearances before signing for Spartak Moscow. A disaster from start to finish.