The returning Gary Doherty scored 10 minutes from time to earn the Blues a 2-2 draw with promotion-chasing Rotherham.
However, Doherty had the final say after replacing the injured Dave Winfield in the 74thminute as he headed in Sam Wood’s corner to secure a share of the spoils.
Gareth Ainsworth made one change to the Wanderers team with Bruno Andrade in for the injured Anthony Stewart. The centre-back fractured his left hand in Saturday’s defeat to Rochdale and has been ruled out for the rest of the season.
The change meant that former Rotherham loanee Sam Wood reverted to left-back with Charles Dunne moving across to the heart of the defence.
Gary Doherty was back in the squad for the first time since injuring his back against Crewe Alexandra in early November.
Ainsworth’s men started brightly and took the lead in the seventh minute. Matt McClure did well to turn away from Claude Davis and find Stuart Lewis who drove into the area. The ball then broke to Dean Morgan and he crossed from the right for Grant to tap home from close-range.
Grant was having a field day early on and the Rotherham defence were giving the winger far too much room in and around the area.
Josh Scowen had a 20-yard effort well blocked after beating Ben Pringle to a ball in midfield that he had no right to win.
McClure was forced off after 20 minutes through injury with Jo Kuffour on in his place. The break in play disrupted Wycombe and the visitors had their first shot two minutes later when Michael Harriman’s header fell for David Noble on the edge of the area and he took a touch before striking goalwards. However, Jordan Archer was equal to his effort.
The Millers came into the contest as the half progressed, but the majority of play was in the midfield area with neither side threatening to add to the score.
The next real chance came five minutes before the break when Dave Winfield eluded his marker to reach Sam Wood’s corner first, but Blues’ skipper headed wide of Andy Warrington’s goal.
Rotherham levelled with their first attack of the second half when Nardiello out-jumped Sam Wood and headed Liam Ridehalgh’s deep cross past Archer and into the far corner from eight yards.
Morgan almost restored the Blues’ lead in controversial circumstances on the hour when he didn’t realise the Wanderers were returning a drop-ball and tried to round Warrington, however, the keeper made a good save.
The incident fired up the visitors and they took the lead three minutes later when a quick free-kick found Ben Pringle on the left and his dangerous cross was poked home by Nardiello from six yards for his second of the evening.
Morgan should have levelled in the 71st minute when Scowen won the ball in the midfield and found Kuffour who squared to his strike partner, however, he fired over the bar from eight yards whilst under pressure from a defender.
Ainsworth introduced himself 18 minutes from time and the Chairboys were forced into a final change two minutes later when Winfield limped off to be replaced by Doherty.
Dunne’s long-ranger was deflected inches over in the 80th minute, but Doherty headed home the resulting Wood corner to draw the Blues level.
Archer saved Kayode Odejayi’s close-range header with his feet in injury-time.
Wanderers: Archer, Harriman, Wood, Dunne, Winfield (c) (Doherty 74), Andrade (Ainsworth 72), Lewis, Scowen, Grant, Morgan, McClure (Kuffour 20). Subs: Harrison, McCoy, Morias, Oli.
Rotherham: Warrington, Tonge, Davis, Mullins, Ridehalgh, Noble, O'Connor, Pringle (Agard 90), Frecklington, Nardiello (Kearns 85), Revell (Odejayi 87).
Subs: Shearer, Morgan, Rowe, Agard.
Attendance: 2,581 (178 Rotherham)