Trashorras has said that as long as Rayo stay true to their style of football and attack then a result is possible.
"We believe we can win at the Bernabeu," AS quotes Trashorras as saying. "We will go with the intention of playing a good game and win."
"We must be faithful to our style and be brave. If we stand back we are going against what has brought us this far.
"Being aggressive and wanting the ball is the only way to get something at the Bernabeu."
Rayo are currently sixth in La Liga and are level on points with fifth-placed Valencia.