The Portuguese striker is not expected to play for Swansea again.
Swansea City have something of a striker crisis on their hands at the moment. The club sold Wilfried Bony to Manchester City in January, but were hopeful they could count on Bafetimbi Gomis and Nelson Oliveira for the rest of the season.
But Gomis picked up a hamstring injury against Everton last month and Nelson Oliveira has been filling in since. He finally found some form for the Swans, finally netting his first goal in over a year in a recent game against Newcastle United.
But he picked up an ankle injury against Stoke City, which Portuguese source Relvado claims has ended his Swansea City stay prematurely.
They claim he is set to return to Benfica for the rest of the season as his injury will see him out of action for the remaining three games of the campaign.
Swansea take on Arsenal this weekend, with the hope that Gomis can feature. The Frenchman has trained this week, but Garry Monk would not want to throw him in at the deep end.
That would mean Marvin Emnes playing up front of perhaps giving a chance to a young player or playing Modou Barrow through the middle.
As for Oliveira, Swansea are unlikely to keep the player considering his low goal count at the club during his loan spell and he will be looking for another new team in the summer.