Alexander Mattison is the new leader in the Vikings backfield.
His long-awaited promotion became official Friday when the Vikings released running back Dalvin Cook, Mattison's close friend whom he followed in practices and games for four seasons. Now Mattison is the unquestioned starter, bringing more playing time at a stage in his career — he turns 25 on June 19 — where he's naturally feeling more comfortable.
"Just coming in with the confidence of being a seasoned vet now — sounds weird to say," Mattison said after a spring practice last month.
The Vikings turn to Mattison as head coach Kevin O'Connell wants a more efficient running game.