By North-west correspondent Alex Stevens

Liverpool are set to announce on Tuesday that they have completed the signing of Marko Grujic from Red Star Belgrade, Football Insider sources understand.

The central midfielder has already undergone a medical but the Merseysiders have been waiting for a work permit to settle the formalities of the deal.

Writing on his Facebook page, the Serbia Under-21 international intimated the move  to Anfield will be completed on Monday. “On January 4, I will become a Liverpool player,” he wrote.

However, a Liverpool source has told Football Insider that an announcement is not due for another 24 hours.

The Merseysiders have finalised a deal for central midfielder Grujic to move permanently to Anfield in a £5million deal, be loaned back to Red Star for the rest of the season and then move permanently to Merseyside next summer.

Liverpool chief executive Ian Ayre agreed the terms of the signing when he flew to Belgrade a fortnight ago.

Hot pursuit: Liverpool are closing in on their first signing of the Klopp era

Hot pursuit: Liverpool are closing in on their first signing of the Klopp era

Grujic is regarded as one of the most promising young talents in European football and has been targeted by a number of elite clubs including Chelsea, Manchester United and Inter Milan.

Cash-strapped Serbian Super League leaders Red Star admitted their financial position dictated they cash in on the 6ft 3in midfielder, who has scored a creditable five goals in 21 league matches this season.

The sale of Marko Grujic would enable Red Star to pay staff wages with the club reportedly needing around £2m to stave off current debts.