Sanchez's form has come under the spotlight with the Chile forward having failed to find the net in 14 league appearances this term, but Roura has no worries over the 24-year-old's form.
"We have no concern with him," the Barca number two added. "He's a very important player for us, with an irreproachable attitude. He's going through a rough patch in front of goal, but these things change. We are delighted with him."