Everton boss Sean Dyche says the use of the video assistant referee pitchside monitor is "testing my patience" after striker Dominic Calvert-Lewin was sent off at Crystal Palace.
The 26-year-old was dismissed for the first time in his career in the 0-0 FA Cup third-round draw at Selhurst Park.
He had his studs up in a challenge with Nathaniel Clyne and clipped the Palace defender's shin with minimal contact.
"The slow motion shows a different picture," said Dyche.
"If you want to slow-mo everything, you have to slow-mo everything. There's minor contact and in live time he [referee Chris Kavanagh] doesn't give anything, then they slow it down and everything looks worse.