Liverpool manager Jurgen Klopp offered a frank and forthright apology for his behavior in his blow-up with referee Paul Tierney.

The German coach was involved in a touchline spat with Tierney last month.

Klopp was incensed by Tierney during his side's 4-3 win over Tottenham in the Premier League, accusing the referee of bias against him and his team.

“How they can give a foul on Mohamed Salah [before Spurs' third goal]. We have our history with [Paul] Tierney, I really don't know what he has against us, he has said there is no problems but that cannot be true," he told Sky Sports after the final whistle.

In a letter submitted on May 3, Klopp apologised for his behavior: “I want to start this submission with the most important sentiment I must express; I am sorry.

“I am sorry for my reaction in that immediate moment when I ran towards the fourth official, Mr Brooks and I fully accepted a caution was justified. I accepted that then and I accept now that a yellow card was correct.

“Equally I am sorry for some of the tone and content of my post-match interview. Although it was not my intention I accept now it appears that I was questioning Mr Tierney's integrity. I take ownership of this. On reflection, the words I used were inappropriate.

“Both of these incidents were driven by emotion. I was overly emotional at some of the decisions made, which then led to frustration and a feeling of unfairness. I carried that emotion into the mandated and time sensitive post-match press commitments."

Klopp continues: “I do ask that you look at the comments I made in the following context; we are, as managers, contractually required to make ourselves available in a timely fashion. This doesn't readily allow for a more measured approach. Also, English is not my primary language and at times what I mean to say and how I say it can conflict.

"For the avoidance of doubt, I was trying to express how I felt whilst dealing with the frustration I was feeling around a number of decisions made during the game. It was about feelings and emotions. To be absolutely clear, I know that Mr. Tierney, along with all other officials, do their work without any preconceived bias or prejudice.

“Although not an excuse, I believe we have made up a high percentage of Mr Tierney's matches this season? Something in the region of 20% of the matches he has officiated have involved my team. I do not offer this as a defense, rather it is an observation and could be a reason for both the build-up of frustration governed by an inadvertent accumulation of incidents over an extended period.

“Hopefully you saw in my very next press conference (Tuesday 2nd May, 2023) I sought to clarify and correct any wrong conclusions drawn from the words I used in the interview on Sky Sports, which took place matter minutes after a tumultuous and highly dramatic game ended."