Liverpool have agreed a British transfer record fee of £125m to sign striker Alexander Isak from Newcastle United.

Sources close to the deal have told BBC Sport that an agreement for the Sweden international to move to Anfield is now in place.

Isak is expected to undergo a medical on Monday before signing a six-year contract.

Liverpool had an original £110m offer rejected in August but are now set to land their first-choice target of the summer.

The protracted saga involving the 25-year-old appears set to come to an end on the final day of the summer transfer window, and it follows Newcastle having signed striker Nick Woltemade from Stuttgart last week.

Earlier this summer, Isak was left out of the Newcastle squad for their pre-season tour of Asia with what the club described as a "minor thigh injury", while it was understood he wanted to explore a move away.

He then trained alone at his former club Real Sociedad before Liverpool's initial bid for him was knocked back by the Magpies.

Amid continued speculation about his future, Isak released a statement in which he said promises had been "broken" by Newcastle and that their "relationship can't continue".

BBC Sport understands that Isak believed he would be allowed to leave Newcastle if a big club came in for him and offered the right price.

Newcastle said that "no commitment has ever been made by a club official that Alex can leave Newcastle United this summer".

However, a move has now been agreed after Isak remained on the sidelines at Newcastle and missed their opening three Premier League games, which included a 3-2 defeat by Liverpool at St James' Park.