Manager Mauricio Pochettino says new signing Lesley Ugochukwu may go on loan after the midfielder joined Chelsea for 27m euros (£23.2m) from Rennes.
Ugochukwu has signed a seven-year deal but Pochettino has not yet decided the Frenchman's immediate future.
The 19-year-old has made 47 Ligue 1 appearances for Rennes and has also featured in the Europa League.
"We need to assess him when he starts training today and then in London after the tour," said Pochettino.
"He's a young, talented player. Now is the time to assess him until the end of the transfer window and see if he is going to be with us or maybe it can be a possibility to loan him.