The key man for all 20 Premier League sides.
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Arsenal – Laurent Koscielny – The Frenchman formed a superb partnership with Per Mertesacker last season and is key to holding the Gunners’ defence together.
Aston Villa – Ron Vlaar – Keeping the Dutch international fit and tying him down to a new deal will be vital for Paul Lambert, with Villa’s defence noticeably weakened without him.