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Arsenal tried to sign Phil Jagielka in the summer but lost interest when Everton demanded a similar fee to the £22 million they received from Manchester City for Joleon Lescott.
That was prior to the arrival of Sebastian Squillaci who was signed for a much more modest £3.5 million. It is possible Wenger could rekindle his interest in Jagielka in January but it is unlikely that Everton will be willing to lower their demands.
Jagielka is not the type of player to agitate for a move and this is another deal which is unlikely to get done until at least the end of the season. The former Sheffield united defender would provide some much needed solidity in the centre of defence and ultimately could be a long term partner for the injured Vermaelen.
Signing a player of Jagielka's calibre would give Arsenal five first team centre backs, one too many, meaning that either Djorou or Squillaci would probably have to move on. The former is a prospect who Wenger will be reluctant to part with while the latter has impressed since joining from Sevilla.
Koscielny has been a little inconsistent but Wenger is not the type of manager to splash out £9 million on a player only to lose faith in him after a handful of games.
Jagielka is probably the right player for Arsenal but January will almost certainly be the wrong time for him to make the move from Everton.