Liverpool are preparing to sell Marko Grujic for a mammoth profit this summer, Football Insider understands.

The central midfielder, who turns 24 in April, has established himself as a Bundesliga star during his two seasons out on loan at Hertha Berlin.

A Liverpool source has told Football Insider the club are willing to listen to offers for Grujic in the next window and expect to sell him for a £25million-plus fee.

That would represent a profit of more than £20m for a player who was Klopp’s first signing for the Merseysiders back in January 2016 for £5.1million.

The club’s loans manager Julian Ward is closely monitoring the development of the Serbia international and delivers regular reports to Klopp’s coaching team about his performances for Hertha.

Grujic is a key player for 14th-placed Hertha and has started 19 of their 21 Bundesliga matches this season.

Liverpool have been impressed by the progress made by the 6ft 3in powerhouse, who has smoothed out the rough edges to his game in the last two seasons.

But they do not currently expect him to be a regular starter in Klopp’s all-conquering side next season.

Grujic has spoken of returning to Liverpool to make his mark at his parent club after offers were rejected for him from Premier League and Bundesliga clubs last summer.

But he also wants regular game time and this summer may be the best time to cash in on a player with a contract until the summer of 2023.

The Serbian was hailed last season by former Hertha manager Pal Dardai, who has been at the club for over 20 years, as “by far the best midfielder I’ve seen in my time at the club.”

In other Liverpool news, it can be REVEALED that the club are set for a £500m announcement soon.