Betvictor has Turan priced at 1.33 to sign the Turkish international with Manchester United second with odds of 4.50.
Barcelona have also been closely linked with the 28-year-old but have not been offered betting options.
Turan is set to complete a move to the La Liga champions Barcelona according to a report in Mundo Deportivo but his agent Ahmet Bulut denied being in talks with the Champions League winners.
“I have not spoke with anyone from Barcelona these newspaper stories are just rumours,” Bulut told NTV Spor.
“I am not going to say where Arda is going right now it is not the right time I would love to say but in three to four days the club will let you know anyway.”
BetVictor recently struck a deal to become the global betting and gaming partner of Chelsea.
The betting company will be involved in social media and digital campaigns with the Blues as well as offering special betting offers and markets for Chelsea fans.
Turan will leave Atleti over the next few days according to his agent Ahmet Bulut. The Turkish international also confirmed that his agent is in talks with up to four clubs on his twitter account.