United sealed a 2-1 victory deep into injury time, thanks to a goal by South Korea international Ji-sung Park.
“We’ve done it so many times and you have to admire the perseverance of the team, the never say die (spirit),” Fergie told MUTV.
“It was a long struggle. Given the changes I had to make, trying to get the continuity of performance was difficult today.
“I thought Wolves were the better team in the first half, they played very well but we got a great goal right on half-time and I thought that would settle us. In the second half we were the better team. We lost a bad goal on our part but went on to get a late winner.”
Ferguson has admitted his side has been struggling with a virus this week.
“Some players played with touches of flu and others with diarrhoea, so we’ve done really well to get a result,” he said.
“This morning we had to check on Patrice Evra, Paul Scholes and Nemanja Vidic, they were all under the weather.
“Nemanja in particular did well to play in that game, Patrice battled on and I was only going to use Paul if I needed to. I did need to and he did well.”
