The manager has been speaking to the Liverpool club website:

“I am really, really happy we have got Alex signed. Since the last game I have been waiting and hoping we could make this transfer - and when I got the news he was ours it was fantastic.

“I remember the first time I saw him play live - it was at Dortmund in 2014 and he came on as a sub that day and made a big impact. He stood out immediately because of his pace and skills and his attitude in such a big game for a young player; I remember him chasing back to make a brilliant challenge on Mkhitaryan in the box to save a certain goal.

“Since then I have followed him and when I heard it may be possible to sign him I didn't need to think twice.

“I hear a lot of talk about positions but let's talk about the player; he is someone with really good abilities who always gives everything for his team. A player that is positive and willing to take risks to try and make positive things happen.