Chester boss Simon Davies was unhappy with referee Richard Beeby following his side's 3-0 FA Cup defeat to Millwall.
Lewis Grabban hit the opening goal for the League One side, but Davies felt the winger should have already been sent off for a late challenge on Laurence Wilson.
"It annoys you when there's a lad on the pitch that probably shouldn't have been who has scored their opening goal," said Davies. "Laurence has the marks on his legs to prove that it was a bad challenge. I've seen those tackles warrant a straight red but the referee hasn't seen it that way."
Davies also felt the scoreline was harsh on his side, and added: "I thought in the first half we definitely matched them and Ryan Lowe had a chance that he hit over the bar.
"I thought they just kept themselves in the game, hoping their quality would come through and that's what's happened."
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