It is believed that Bakayoko will join the Italians on loan with an option to join permanently next summer.
Mateo Kovacic's arrival on loan from Real Madrid has seen them all fall further down the pecking order.
The French midfielder only joined Chelsea last summer in a £40m deal from Monaco.
CHELSEA star Willian has spoken about Barcelona's attempts to sign him after insisting he is happy to remain at the club.
The player's agent has been in Milan for talks over a loan move, with the European window yet to shut.
"I prefer to have 23 or 24 players and three or four very young players".
And Walker said: "I think we set the bar previous year".
"I want to know the players well".
Former Blues skipper Wise stold Sky Sports News on the battle for midfield berths in Maurizio Sarri's squad: "They've got a fair few in that position that can play there". Then, when my idea is clear, I will make a decision.
He has also been linked to Manchester United and Real Madrid - who are also reportedly interested in Blues duo Thibaut Courtois and Eden Hazard.
Belgium's Batshuayi was the latest returnee who did not feature in their 0-0 draw with Lyon in the International Champions Cup on Tuesday and Sarri says it is better late than never with Chelsea's Premier League campaign kicking off at Huddersfield on Saturday.