Begelton, 23, was released by the Stampeders on June 17 after he injured his knee in a preseason game on June 6.
Begelton caught five passes for 88 yards and a touchdown and was named game MVP in the preseason game against the BC Lions.
The West Brook graduate is Lamar’s all-time leader in catches (227) and yards (2,435).
“It’s a sigh of relief to be back officially on the team,” Begelton said. “I don’t have to wake up anymore from my bed at home wondering if I’m going to get the call or not.”