Le Havre announced on Thursday that a fee had been agreed with the Black Cats but the full-back's representative reveals that his client is still weighing up his options
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But Mendy's agent has confirmed that Ligue 1 giants Lyon and Cardiff City are also in the running for his signature.
"Nothing has been sorted with any club," Sylvain Chavanon told L'Equipe.
"Sunderland are one of the teams that we are in talks with.
"There is also Lyon. Cardiff have spoken with us, but we don't have any news at the moment."
Another Le Havre player, El-Hadji Ba, also looks set to join Sunderland this summer.