The Merseysiders travel to the Stadium of Light tomorrow knowing that defeat would see Newcastle and Norwich City relegated.
Sam Allardyce's side, in 17th, are now big favourites to avoid the drop following their remarkable 3-2 win over Chelsea on the weekend, whereas United drew 0-0 away to Aston Villa in a result which might yet cost them their place in the Premier League.
With all of Tyneside donning Everton shirts for their trip to Wearside, Colback, who began his career at Sunderland, says there's no reason why Roberto Martinez's troops cannot get one over on his former side.
"Everyone's gutted. It's obviously out of our hands now but we just have to pray Everton do us a favour," the midfielder said via BBC Sport.
"They're a good side, so there's no reason why they can't go to Sunderland and get a result."
Even a draw with Everton would practically leave Allardyce and co only needing a point from their final game - a visit to Watford - to relegate Newcastle, who host Spurs on the final day this Sunday.