Chelsea are launching a January bid for Bayern Munich midfielder Arturo Vidal.
The Sun says Chelsea are preparing an opening offer of £33m. But the German champions are holding out for a figure closer to £53m.
Chelsea have also offered Vidal a four-year contract worth £13.4m per season.
Blues boss Antonio Conte has spoken about Vidal, 30, in glowing terms in recent weeks.
He said the midfielder was a player he would choose to go to war with.
The 97-cap Chile legend has just 18 months left on the four-year deal he signed to join the German champions in 2015.