Manning said that he is unsure of what type of offense McAdoo wants to run, but is looking forward to finding out when practice starts again.
"I think in a way it will be exciting knowing that you've got to come in and you've got to learn some new things," he told the club's official website.
"Right now, I don't know exactly what the changes will be, if it will be completely changed terminology and formations or if we'll keep some of those things and just bring in his concepts. I don't know if the coaches have all figured that out exactly as well. I'm looking forward to figuring out all those things and I want to get to work."
The Giants finished third in the NFC East with a 7-9 record.