 After making his return against Partick Thistle and St Mirren, Letheren was once again sidelined after suffering an injury in the warm-up ahead of the Dundee derby against Dundee United, which allowed Arvid Schenk to take his place, although Schenk went on to concede six goals, in a 6–2 loss.Though he recovered from his injury, Letheren lost his first choice goalkeeper status to Scott Bain throughout the season.However, Letheren was given a chance to play the last three matches at the end of the season following Bain's injury.