Romelu Lukaku did not join up with Chelsea for pre-season on Wednesday as originally planned.
The decision for the forward to not link up with the Chelsea squad was mutually agreed by Lukaku and the club.
New manager Mauricio Pochettino previously said he expected all returning players, including Lukaku, to come to his office for an introductory conversation.
All parties agree the right option is for the Belgium striker to move on, with Lukaku favouring a move to Inter Milan despite interest from Saudi Arabia.
Chelsea hope that delaying his return to London will allow the clubs more time to find a solution.
Inter are yet to agree a deal with Chelsea but negotiations are ongoing. Chelsea leave for their US tour on 17 July and hope a deal can be reached before then.
Chelsea start season against Liverpool, live on Sky
Mauricio Pochettino will take charge of Chelsea for the first time when they start the 2023/24 Premier League season at home to Liverpool, live on Sky Sports, on Sunday August 13.
Chelsea then head to London rivals West Ham on August 19 before welcoming newly promoted Luton Town to Stamford Bridge on August 26.
Pochettino, who begins his role with the Blues on July 1, will visit his former club Tottenham on November 4 with the return fixture scheduled for February 24.
Follow the summer transfer window with Sky Sports
Who will be on the move this summer when the transfer window opens on June 14 and closes at 11pm on September 1 in England and midnight in Scotland?
Keep up to date with all the latest transfer news and rumours in our dedicated Transfer Centre blog on Sky Sports’ digital platforms. You can also catch up with the ins, outs and analysis on Sky Sports News