Antoine Griezmann's move to Barcelona could be blocked in a row over the fee, La Liga president Javier Tebas says.

Atletico Madrid complained after Barca announced they had signed the France forward, having activated his 120m euro (£107m) release clause on 12 July.

The clause dropped from 200m to 120m euros on 1 July, but Atleti claim the deal was done before then and that they are due the larger amount.

"It is possible to block a player's transfer," Tebas told Onda Cero.

"La Liga will have to decide what course of action to take."