The Dutch keeper played 90 minutes as Ole Gunnar Solskjaer's side beat Everton's second string 1-0 at Widnes with a goal from Kiko Macheda.
Van der Sar had little to do on the night but, after Foster's timid display against Sunderland, there are few who doubt he will be back in the United goal when Fergie's first-team takes on Bolton in ten days time.
"It felt good to be back. There was no reaction at all to the injury. The hand was fine," he said after the match.
"It was a case of getting my sharpness back a little bit and getting angles and getting corners and free-kicks with men around you. It was a perfect game to come back into.
"I think I will be ready for the Bolton game now. It is still ten days away but I feel good. I will train up to then and then hopefully be ready for the start of my season."
The United boss is said to have had a furious row with Foster over his failure to come for the cross which led to Kenwyne Jones' goal at Old Trafford on Saturday, according to the Daily Star.
Ferguson kept post-match interviewers waiting almost half an hour as he tore a strip off the majority of his underperforming side in the dressing room following the final whistle.