8. Martin Demichelis
Manchester City veteran Martin Demichelis made a shock switch to the Etihad last summer to be reunited with Manuel Pellegrini, all at a swift €6m profit to Atletico Madrid.
Demichelis is trusted by Pellegrini to partner Vincent Kompany in central defence, but has been exposed by top strikers in the Premier League and Champions League consistently this season.
The 33-year-old's most glaring error cost City their place in the Champions League, hauling Lionel Messi to the floor and handing Barcelona a man and goal advantage they were never likely to pass up in the last-16 stage earlier this year.