The Costa Rican winger showed glimpses of his quality in his first season in English football, and now his manager wants him to become a key player at Craven Cottage
Ruiz moved to Craven Cottage from Twente last summer for £10 million and scored twice in 30 appearances before his season was cut short by a broken foot.
But after scoring in Fulham's 3-0 pre-season friendly win over Wycombe, Jol feels the Costa Rican can show why the Cottagers splashed out to bring him to the club and become a key player for the team.
"It was good to see Bryan Ruiz back to full fitness," Jol told reporters after the Wycombe game. "He showed some very good touches and I thought he was the best man on the pitch.
"He's a terrific player so hopefully he can show our fans now. He needed six months [to adapt to English football], and I thought over the last few months after that he was good.
"Then he had a horrific injury and was out for four or five months, so I was very happy to see him back."