Manchester United have been cut from 11/1 to 5/2 favourites by Sky Bet to sign Radamel Falcao in the summer transfer window.
A report in Spanish newspaper Marca on Wednesday claimed United were in advanced talks over a deal and now there are rumours that the Colombia international could make arrive in a deal that will see Javier Hernandez used as part-exchange.
The 27-year-old has enjoyed another stellar season with 22 goals so far in the Primera Division and Atletico manager Diego Simeone expects interest in his star man.
"Falcao is a great player and it's logical that the best teams in the world are interested in him. It doesn't surprise me," he told reporters on Wednesday.
Chelsea and Real Madrid are the joint second-favourites at 5/1 to sign the striker.
Sky Bet's Chris Spicer said: "United are attracting the early money on securing Falcao's signature as the rumour mill begins to churn ahead of the summer transfer window.
"Chelsea, who are now 5/1, had previously been backed into favouritism, but reports are now suggesting that Sir Alex Ferguson is putting together a hefty deal, which could include Javier Hernandez going in the opposite direction."