Raul's contract with the club expires at the end of this season and there has been no agreement between both parties regarding a contract extension so far, with the Spaniard keen on a two-year deal while Schalke are partial to a one-year extension.
Stevens is in the dark over the talks, although he is keen to retain the services of the veteran striker.
"I am not surprised by Raul's displays, I knew about his quality," Stevens told reporters at a press conference, "He is a great team player. If he stays at Schalke or not, you will have to ask him."
Speaking ahead of the Europa League tie against Athletic Bilbao at the Veltins Arena, Stevens insists that he didn't need to seek advise from his Spanish players for information on the club that eliminated Manchester United from the competition.
"We know Athletic and what their qualities are," the 58-year-old said. "There was no need to ask them, but if there is some surprise in their starting lineup, we will search for information."
Schalke are currently third place in the Bundesliga, four points from second-placed Bayern Munich.