The former football star and current co-host with Kelly Ripa of "Live With Kelly and Michael" got a red-carpet welcome from the "GMA" team.
Anchor Robin Roberts expressed excitement that Strahan will be there "a couple of days a week."
Then the cast presented him with an alarm clock and a huge coffee cup.
His brief appearance ended with promises he'll be back "next week."
Strahan joins Roberts, George Stephanopoulos, Amy Robach, Lara Spencer and Ginger Zee on television's top-rated morning show.
Unconfirmed reports of Strahan's new part-time gig surfaced early this month. He has said this side job won't affect his daily duties hosting "Live."