The Irishman has missed two games with a thigh injury and will not be risked if he is not fully fit after centre-backs Gavin Gunning and Brian McLean helped United keep clean sheets at Stranraer and Dundee in his absence.
Manager Peter Houston said: "It's touch and go whether he comes back on Saturday. He is doubtful."
Inverness come to Tannadice having lost just once since their 4-0 victory over United on September 29, which was their first Clydesdale Bank Premier League win of the season.
Houston said: "I think we gave Inverness the confidence to go on this run by scoring four goals against us. They have never looked back since that day.
"We have to be like we have done in the last couple of games and get a clean sheet at least. But we know Inverness will not come down to sit behind the ball.
"They will come to try and win the game and it's only a couple of seasons ago that they came and scored four against us here.
"We have had bad days against Inverness in the past couple of years but we have had good days as well and hopefully Saturday we can make sure it's a good day."
- Sports & Recreation
- Clydesdale Bank Premier League
- Gavin Gunning