London  - Liverpool co-owner Tom Hicks moved Sunday to explain why he demanded chief executive Rick Parry should resign.

Hicks wrote to Parry last week calling on him to stand down.

Parry had been key in bringing Hicks and his partner George Gillett, and, as the boardroom hostilities at Anfield intensify, he refused Hicks's call.

But Hicks renewed his attack in the Mail on Sunday newspaper.

"Rick Parry has been Liverpool's CEO for 10 years and we haven't won a league championship under his leadership," he said.

"Our commercial revenues have not kept up with other top clubs during that time, which has made it very difficult to compete for the Premier League.

"After watching him operate, I came to the conclusion it was time to ask him to resign, due to his inability to manage an organization, his seemingly arrogant attitude to our supporters and his lack of communication with Rafa (Benitez).

"I reached my decision a few weeks ago but waited until after the games against Everton and Arsenal.

"It is important to try to have a new CEO in place by May so we can begin working with Rafa on player transfers." (dpa)