Confirmation of a new deal for Kamui Kobayashi is likely "soon", according to Swiss newspaper Blick.
The report said the Japanese, whose exciting racing style has earned him many fans since he debuted for Toyota at the end of 2009, is an attractive prospect for "a lot of teams" but will almost certainly stay at Sauber.
"As long as I drive for Sauber, I give everything for this team, because without Peter Sauber I would not be in Formula One now," the 24-year-old said.
Kobayashi was also quoted as admitting to looking forward to Silverstone this weekend, after three consecutive races on street circuits.
"Monaco, Montreal and Valencia, that was a bit too much," he said. "Finally we are back to proper tracks with super-fast corners."