Throughout the start of the 2014–15 season, Collin was a pivotal member of the Rotherham side that maintained unlikely survival in the Championship, despite a late 3 point deduction, and a sizeable gulf in the budgets available at Rotherham and their fellow competitors. Collin was the main starter for Steve Evans as he picked him over Scott Loach and loan signing Emiliano Martinez of Arsenal and despite some dip in form towards the latter stages of the season, being replaced by Martinez in particular, played 36 times in the league and once in the FA Cup and was even named in an article in The Guardian as one of the Football League Championship's six most influential players.