Gremio have told Lazio to up their offer for defender Rever.

Lazio have made a bid for the youngster, but it fell short of Rever's £4 million buyout clause.

Gremio president Duda Kroeff said: "I am not obligated to sell because the buyout clause requires me to sell him for £4 million at one time.

"The offer of Lazio is real, but they do not want to pay everything at once, so they must increase the bid."