Chelsea are interested in signing Barcelona defender Thomas Vermaelen, as well as considering Valencia's Aymen Abdennour.
According to the Metro, Guus Hiddink's team are searching for a new centre-back after letting in 34 goals in 23 games, with captain John Terry far from his peak.
Vermaelen is on the Blue agenda. The Belgian centre-back is remembered in the Premier League as a good player after his performances with Arsenal.
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However, Vermaelen still has Luis Enrique's trust as a the third choie centre-back, ahead of Marc Bartra and Jeremy Mathieu, with the latter more often used at left-back.