Partick Thistle's request to have their Premier Sports Cup tie against Motherwell replayed has been denied after Scottish football authorities blamed a substitution mix-up on human error by a match official. The club was prevented from bringing on striker Rocco Diack during the goalless draw after being informed he was not on the teamlines. This was due to fourth official Greg Soutar failing to spot the 19-year-old's name on the app because his name was on the second page of the screenshot. Partick Thistle wrote to both the Scottish Football Association and the Scottish Professional Football League, inviting a full explanation of Sunday's blunder. The club claimed that they had been placed at a sporting disadvantage and that the error materially impacted the game. Jags officials submitted a request to the Hampden authorities that the match be replayed but this appeal has been dismissed. A new Thistle statement read that both the SPFL and Scottish FA have confirmed that the fact they were denied the opportunity to introduce Rocco Diack as a substitute during Sunday's second half was due to human error by a match official. The SPFL also confirmed that while this particular error is an unusual one, the SPFL does not replay matches as a result of errors by Match Officials. Partick Thistle will pay Rocco Diack the appearance bonuses he was due had he been able to appear as a substitute on Sunday. The club's full focus is now on Saturday's William Hill Championship fixture at home to Morton.