On Monday, Disney-ABC Domestic Television had said Ripa will officially announce her new partner as he or she joins her on stage for the Sept. 4 broadcast.
Strahan, a former NFL defensive star, also headlined a short-lived Fox sitcom, "Brothers," in 2009.
Philbin, the original "Live!" host, exited at age 80 after presiding more than 28 years alongside several co-hosts.
Ripa became his on-air partner in 2001.