In 2007, Fontaine played in 16 of 18 games for Toronto, mainly as a backup defensive end and special teams. He finished second on the team in special teams tackles with 18. Although he was transferred from linebacker to defensive end during training camp he appeared at middle linebacker in place of Mike O'Shea in week 6 against Winnipeg. In week 17 at Winnipeg he arguably had his best special teams game recording, a blocked punt and a forced fumble both returned for touchdowns. After his performance he was named CFL Special Teams Player of the Week.