Munster head coach says he was pleased with how Andrew Conway responded to his glaring error against Connacht to play a significant role in the 27-14 victory at Thomond Park.
Munster will host Benetton Rugby in next weekend’s Guinness Pro 14 semi-final play-off at Thomond Park but are now sweating on the fitness of Conor Murray, Joey Carbery and Keith Earls, with the scrum-half crying off minutes before kick-off.
Connacht were already assured of a play-off away to Ulster regardless of the result, and were outscored three tries to two.
Indeed the hosts could and should well have had four. Winger Conway had egg on his face after failing to finish an intercept try - former Munster winger Stephen Fitzgerald chased him behind the posts and knocked the ball out of his grasp.
However a subsequent two-try surge had the hosts 10 points clear at the interval and they eventually out by 13 points.
Van Graan however admitted it was an unacceptable error.
"It’s not good enough. Once we are over the line we have to score the try," he told RTÉ Sport.
"Fair play to Andrew, he realised his mistake straight away, he had a big hand in the next two tries. It was a good response for the team."
Neil Cronin was a late inclusion in the starting XV after Murray appeared to hurt his neck in a warm-up drill, with Academy player Craig Casey making his debut off the replacements bench.
Van Graan admitted there was no point risking Murray taking into account the bigger picture.
"He is one of our best players and we know we have a knockout game ahead"
"He went against head shields and he just got a knock and stiffened up immediately. The medical team assessed him and we decided it wasn’t worth the risk.
"He is one of our best players and we know we have a knockout game ahead."
With Carbery (hamstring) and Earls (thigh) battling to be fit for next weekend, Van Graan admits he is unsure what squad he will have to choose from for the visit if the history-making Italians.
"We’ll reassess how the weekend goes. The good thing is now we have seven days."
Most will expect Munster to make home advantage count against a side who have never gone beyond the regular season, but the South African is wary of the threat they will pose.
"They drew against Leinster the last time they came to Ireland. We saw first-hand a few weeks ago (37-28 win) what a tough opponent they are, and this is now cup rugby."