Fulham striker Luciano Vietto has agreed personal terms with Sporting CP.
A Bola says Atletico Madrid are waiting to hear from the Cottagers over whether they'll sign him permanently.
And until Fulham say so, Atleti can't send him to Sporting Lisbon, who have agreed terms over a deal and a five-year contract.
The Cottagers will release the Argentine at the end of the season after their relegation.
Vietto has struggled to make an impact at Fulham this season.