Udinese sporting director Fabrizio Larini insists Luis Muriel isn't for sale.
Muriel was watched by Manchester City coach Angelo Gregucci on the weekend.
"Muriel is a major talent," he told reporters. "There will be time to talk about his future, but that is not now.
"Neither Fiorentina nor Juventus have made an offer for him.
"He is still very young and has plenty of time to grow.
"Udinese want to keep him for another year - and I think for him that would be the right thing to do."