United won 1-0 against Tottenham at Old Trafford on Sunday after new signing Nani drilled in his first goal for the club.
Fergie said: “That was narrow, touch and go, nothing to choose between two sides. They dug in and got forward a bit and there was really nothing in it in the second half.
“I thought we lacked a little bit of confidence. Players are anxious, there is a lot of expectation here, there are new players here and what was required was to dig in, show great commitment and we did that.
“As for the penalty appeals, at the time they protested so much I thought it was a penalty, but Wes said it has hit him on the chest. It does hit him on the chest, I’m sure of that.”