The 28-year-old 53-times capped Dutchman agreed personal terms and passed a medical, and will complete the move on Monday.

The former Barcelona and Chelsea star -- who was influential in Boro's League Cup winning campaign in the 2003-04 season -- will be eligible for Liverpool's Champions League qualification campaign on July 13.

Zenden joined Middlesbrough on a permanent basis last summer after a successful season on loan from Chelsea.

"Bolo Zenden has passed his medical," said Liverpool spokesman Ian Cotton.

"We have reached an agreement with the player and expect the contract to be signed on Monday morning.

"He will then be introduced at a press conference later that afternoon."