Amari Cooper's prospective return for the Dallas Cowboys against the New Orleans Saints is in doubt, with the wide receiver still not 100 per cent fit after his positive coronavirus test.

Cooper, who is unvaccinated, has missed the last two Cowboys games, both of which have ended in defeat.

With three losses in their last four games, the Cowboys have gone from 6-1 to 7-4 and have seen their lead in the NFC East trimmed.

Dallas will hope to get back on track against a slumping Saints team on Thursday, though they may have to do so without Cooper once more.

Asked about Cooper, Cowboys head coach Mike McCarthy said the former first-round pick is "still not feeling the best".

"My gut would be if he doesn't practice tomorrow [Wednesday], I don't see him going to the game," said McCarthy, who himself will not be able to attend Thursday's game due to COVID-19 protocols.

Cooper has made 44 catches for 583 yards and five touchdowns this season.

He has been usurped as the top option in the Cowboys' passing game by last year's first-round pick CeeDee Lamb, who has 740 receiving yards and six touchdowns in his second season.

Lamb returned to practice this week after missing last week's overtime loss to the Las Vegas Raiders with a concussion and expects to play at New Orleans.