The Irish winger, who joined the club from Spartak Moscow in January, claims that he was below his best in the victory over Aston Villa on Saturday.
"I was obviously a little bit apprehensive at the start, a little bit nervous against Aston Villa," McGeady told reporters.
"In the first half I thought I did okay and the second half I probably let myself down a couple of times.
"There were a few little things I was disappointed with."
McGeady joined Everton short of match fitness due to the winter break taken by Russian clubs.