The Spaniard has had an inconsistent run in the Blues team since moving to Stamford Bridge from Liverpool for a record £50m in January 2011.
It appears that Chelsea manager Jose Mourinho has questioned the striker's value, suggesting that the Spain international could move elsewhere within the next six days.
"[He] is not really £50m, maybe [he] is 20 and a half," The Mirror quotes Mourinho as saying. "He scored the goal that won the Europa League. That means some millions. He scored the goal against Everton that put Chelsea in the Champions League. That also means some millions."
Valencia were linked with a move for Torres earlier this summer.