The 66-year-old believes the Italy international represents a good signing for the club but argues he is not "a champion"
Osvaldo is poised to finalise a move from Southampton to the Nerazzurri and admitted he has his sights firmly set on winning a second-successive Scudetto following his loan stint with Juventus last term.
Although he feels the 28-year-old represents a good signing for Walter Mazzarri, Anastasi remains unconvinced that the former Roma man boasts the highest quality.
"He is certainly a very valuable player," the former Italy international told Tuttomercatoweb. "But I don't believe he is a champion.
"Clearly we're talking about a good player and a good signing, even though he isn't a top player."
Anastasi is confident Osvaldo will provide strong enough cover for Inter to compete for both Serie A and the Europa League next term, though he is hopeful a youngster could yet have the chance to break into the squad.
"I think that for Inter to be getting a genuine attacker on these terms is positive," added the 66-year-old.
"With [Rodrigo] Palacio, [Mauro] Icardi, [Ruben] Botta and Osvaldo I think the attack will be okay for the Europa League. Maybe there will even be space for a young player."