Vincent will be absent with a chipped tibia but manager Terry Butcher has no new injuries to worry about.
The Highlanders were only in action for 45 minutes last Friday in the derby against Ross County because the match had to be abandoned due to floodlight failure, and none of the starters picked up any knocks.
Dundee United have no fresh injury worries and will arrive in good heart, following a 4-0 Scottish Premiership win over St Mirren on Saturday.
Defensive duo Sean Dillon and Keith Watson were rested for that fixture but may return for the Inverness clash.
Manager Jackie McNamara said: "Whoever is chosen to play knows the importance of the tie and we'll be going there to get into the next round.
"The lads are all looking forward to the match.
"We're entitled to go there with some confidence after Saturday, that was probably the best we've played all season as a team."