Dundee United chief Craig Levein has thrown down the gauntlet to defender David Proctor.
Proctor has failed to feature since Levein took the reins at Tannadice in October.
Levein admits Proctor was at a disadvantage at the start of his reign, but he also claims the full-back has failed to impress during training.
"What counted against David initially is I didn't know him at all when I came in," stated Levein.
"Since then I've been picking players based on what I know about them and what I've seen in training and as yet he hasn't impressed me enough to be included.
"I've told David it's up to him as it is with others to do more and catch my eye and force their way into the team."