He was on target in the fifth minute of the first leg game in Finland with a clinical finish to give Rovers a 1-0 win.
Hughes said: "Roque's scoring record in Germany was an issue for some people but not me.
"He is a match winner and will score a lot of goals for us, of that I am sure.
"It was an excellent finish so early in the game. He showed his quality and getting a full game will help him.
"We are encouraged by Roque, so early in his career here and he can only get better.
"To be honest I am surprised by how quickly he seems to have adapted. You have to complement him on the way he trains and plays."