It's official. Marko Grujic has become the first signing for Liverpool in the January transfer window. The 19-year-old Serbian midfielder has also in the process become Jurgen Klopp's first acquisition as Reds manager. The midfielder joins the English Premier League side from Red Star Belgrade.

All the paperwork took place at the club's training ground in Melwood today, and Liverpool have announced that the player will be heading back to the Serbian club on loan for the remainder of the season.

Grujic will, therefore, ply his trade at Anfield only next season.

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"I'm very excited and so proud to be here and [be] a member of Liverpool Football Club. I can't wait to get started, play at Anfield and train at Melwood," Grujic told the club's website after putting pen to paper.

"I was thinking about my progress in my next period and decided it was good for me to come here and try to be the best I can. I want to play in front of one of the loudest set of fans in Europe at Anfield."

German coach Jurgen Klopp praised for the club's latest acquisition. "When I came here, our scouts showed me some footage of a very skilled player from Red Star Belgrade," the ex-Borussia Dortmund manager said.

"We watched it, we spoke to him, we met each other – he's a good boy, a young boy but plays an important role at the moment at Red Star, who are the best team in Serbia.

"To describe him, I would say he's a tall boy, but quick and good at technical things. He can play passes and can dribble. But he is young, so he has to develop. He will do this, so everything is okay."