Chelsea owner Roman Abramovich will spend up to £55m in the January transfer window to boost his side's title challenge, with £40m-rated Atletico Madrid striker Sergio Aguero and Monaco midfielder Jerko Leko top of his wish list and Ajax forward Luis Suarez, Roma midfielder Daniele De Rossi and Everton midfielder Jack Rodwell seen as back-up options.

Wolves have put in a £1.5m bid for Monaco's Croatian midfielder Jerko Leko

Celtic have made moves to sign Croatian defender Jerko Leko from Monaco