During his playing days, Ruggeri, who was a centre-back himself, won the World Cup with Argentina in 1986
"Pique is a second-rate [player], like me, like many others," Ruggeri told FOX Sports Argentina.
"He's good looking, he's with the singer [Shakira]... he has a cool beard, but if he played for Valencia, he wouldn't be well known.
"Pique ended up playing for Barcelona.
"He's like me - bang average. A good defender, but not much else.
"He doesn't get put under pressure, except against the big teams.
"Sergio Ramos is the best [centre-back] in the world, by far."