Referee Andre Marriner admits he has agonised over the blunder that saw him wrongly dismiss Arsenal defender Kieran Gibbs on Saturday.
When Gunners forward Alex Oxlade-Chamberlain handled the ball in the penalty area in the 15th minute of Arsenal's 6-0 defeat to Chelsea at Stamford Bridge, Marriner incorrectly showed left-back Gibbs a red card.
He apologised following the game before the Football Association rescinded the red card and decided against punishing Oxlade-Chamberlain.
Marriner mistook Kieran Gibbs for Alex Oxlade-Chamberlain
Marriner will officiate the Barclays Premier League meeting between Southampton and Newcastle this weekend, but admits he has analysed the mistake he made in west London "to death" this week.
Speaking to the Telegraph, he said: "It knocks you for six to be honest. There's a lot of talk out there that referees make decisions, go home and don't care about it but that's so far from the truth.
"You're continuously playing the incident over in your mind. You think about how you could've arrived at the right decision and 'what could I have done differently?'.
Chelsea v Arsenal
"You draw from all these other different sorts of aspects to try and find the reasons why you've made a mistake but equally the best thing you can do is try to park it and move on because this incident happened in the 15th minute of the game.
"Afterwards I analysed it to death."
The 43-year-old has received support from his colleagues within the Select Group of Referees and from the Professional Game Match Officials' Limited (PGMOL).
Gibbs was astonished Marriner mistook him for Oxlade Chamberlain
Ahead of his return to top-flight officiating at St Mary's on Saturday afternoon, Marriner hopes he has got his "mojo" back following a week to forget.
"I made a high profile mistake last weekend but it's like a player who misses a penalty or a goalkeeper who fails to make an easy save, you want to get back out there the week after to put those demons right," Marriner added.
"I'm delighted by the (PGMOL) decision, it shows what my bosses think of me as a referee and hopefully I won't let them down and I'll be able to go out on Saturday and perform at my usual high standard.
"I've met all my colleagues this week so I've received a little bit of banter from them which has been good natured. I've been down in the dumps and it's made me smile and hopefully I've got my mojo back."