American Scott Speed and Italian Vitantonio Liuzzi are likely to stay with Toro Rosso but a deal has still to be agreed, part-owner Gerhard Berger said.
Ferrari-powered Toro Rosso are the only Formula One team with no confirmed drivers for the season starting in Australia on March 18.
"I think our two drivers are in pole position," the Austrian former racer said. "Most likely we are going this route but it is not done yet."
Berger said the team, who have also yet to unveil their new car, had options.
"Money is not an issue," he said. "We are trying to get the best guys in our cars. We are looking for performance.
"It is the performance that will get a driver a cockpit and not a hand waving a cheque. If our main criteria were money, we would have done this already."
Berger said the new STR2 car would be within the regulations, despite rival teams expecting it to be a copy of the Red Bull RB3 - which would not be allowed - and threatening legal action.
I dont think these cars exist just like Barabus
The Stig