The Saskatchewan Roughriders announced a series of roster moves on Saturday, including the release of international quarterback David Watford.

Watford spent the 2018 season with the Riders and was expected to fill the second or third QB position.

Watford's absense on the roaster left room for rookie pivot Isaac Harker.

"He's able to retain the playbook and again I don't want to speak for our offensive guys," Roughriders General Manager Jeremy O'Day said at a press conference. "From my standpoint it just seems like he's operating at a very high level very quickly. He has a command of the huddle, gets them in and out of the huddle and tries to execute and he's very decisive in his decisions."

Among the releases is Crezdon Butler, international defensive back.

"My job is to look at the future," O"Day said. "These tough decisions have to be made. Crezdon's a great pro, we wish him the best."

Butler, 30, had 39 tackles, two sacks and one forced fumble in 15 regular-season games last year. He added eight tackles and a fumble recovery in Saskatchewan's two playoff contests.

Rookie receiver Paul McRoberts was added to the practice roster along with nationa wide receiver, and local talent, Mitch Picton.

"He's been grinding it out on the PR," O'Day said of Picton. "He had a hreat off-season, rookie and mini camp but his injury cost himj some days. He looks like a veteran player."

O'Day said this was one of his hardest days on the job.