"In the 13 years I have been involved in the first team this will be the biggest league game I've played in - it really is that important.
"If we win we can go top of the league with just six games to go and if someone would have told us that we would be in this position when the season started we would have all been delighted.
"This is a massive chance for everyone at the club and I'm sure the fans will create a great atmosphere because they know what is at stake."
Carra added: "The incentive is there for us to go back on top of the league and it may only be for a few hours until United play but you never know it could even be for longer than that.
"That's how big this game is and that's why I honestly believe it's the biggest we've had in the league since I've been at the club and maybe for even longer than that."