Sep.12 (GMM/Inautonews.com) Eddie Irvine is convinced his former Ferrari teammate’s return to formula one is a “waste of time”.

Michael Schumacher, who shared the Ferrari team with the outspoken Ulsterman in the late 90s, had a strong weekend at Monza but his comeback has generally been regarded as mediocre.

“It’s a waste of time,” Irvine scolded on a visit to the Monza paddock, according to Der Spiegel newspaper.

“Schumacher is good but no longer good enough and he was already on the decline in 2005 and 2006 at Ferrari.

“I have no idea why Mercedes invests in such an old driver as the performance curve can only be downwards. He’s too old now to beat the top drivers like Nico Rosberg,” added Irvine.