Moises Caicedo is 13/82.63 to become Mauricio Pochettino's first signing for Chelsea after the Blues abandoned their interested in Manuel Ugarte.
Chelsea had been in talks to bring the Sporting Lisbon man to Stamford Bridge but Paris Saint-Germain offer him more money to join them.
The Blues are the favourites to beat Arsenal 5/23.50 to the signing of Caicedo even though the Brighton man was keen to join the Gunners in January.
The Ecuador international, who is likely to cost at least £80m, will help to reinforce Chelsea's midfield - a key area that Pochettino is targetting this summer as he tries to make their squad more coherent.
The Blues expect to receive an offer from Manchester United for Mason Mount who has agreed personal with the Red Devils.