Jamie Redknapp believes Chelsea striker Fernando Torres peaked earlier in his career, just like former Liverpool forward Michael Owen.
Torres, who struck a brace in the Blues' 3-0 Champions League victory against Schalke 04 in midweek, has never been able to replicate his fine form from his Liverpool days at Stamford Bridge.
The Sky Sports pundit believes the Spaniard may struggle to find his best form again after already peaking.
And Redknapp believes Torres can be compared with former England international Michael Owen as he was placed into the Atletico Madrid starting line-up at a young age.
Writing on his column for Sky Sports, Redknapp said: "Chelsea got an important win at Schalke on Wednesday night - but despite scoring twice, Fernando Torres is still a long way from his best level, which we last saw when he was at Liverpool.
"Some people have tried to talk up his recent performances and say he's back but I remember he had a similar revival under Rafa Benitez last season for a short period.
"Everyone was saying what a good job Benitez had done but Torres has only scored one goal in his last 25 Premier League appearances.
"Of course he's going to show glimpses of form but that's because he's playing in a good side and he's going to get lots of chances.
"Until he starts going past two or three players and smashing the ball in the net, like he used to do at Anfield, I won't be convinced he's back.
"Maybe he's lost some desire for one reason or another - it happens - or perhaps, like Michael Owen, he's one of those players who peaks in their mid-20s. After all, he was in the Atletico Madrid starting line-up from a young age and captain at 19."
Torres will be hoping to keep his place in the side ahead of a crucial match for Jose Mourinho's side as they take on title rivals Manchester City at Stamford Bridge this weekend.
However, the Special One will have to pick between Torres, Samuel Eto'o and Demba Ba for a starting berth.