Tomasz Kuszczak replaced the England hopeful for the Champions League clash with Wolfsburg on Wednesday.
“Tomasz Kuszczak produced a very good performance against Wolves last week and we felt he deserved to play another game,” Ferguson said.
“It wasn’t going to be last Saturday though because we had to give Ben some support after that difficult game against Manchester City.
“It was a good opportunity for us to play Tomasz (against Wolfsburg) but Ben will play on Saturday.”