"He has made steady progress, but it is difficult to say how long it will take or how it will progress. It needs time and we cannot look too far ahead, so we take each day as it comes, see how he feels, and then make progress from that."

Achterberg is also pleased with how Alisson's deputy Adrian has adapted to life at Anfield, "Obviously he needed to adapt to the way we play, with wanting him to play out, but he’s done good and picked everything up. We couldn’t be any happier with how it’s gone.

"Coming to Liverpool, there are high expectations but he has dealt with them really well. He has stayed calm and relaxed and shown a positive, confident manner, which helps the team a lot".

The 32-year old Spaniard was another to stay on Merseyside while his team-mates represented their countries this week, "Obviously Adrian came late in the summer to us and then after that he had an ankle injury, so we thought it would be beneficial to do some more sessions to keep it going, really", Achterberg told LiverpoolFC.com.

"We did some decent workouts with him. Distribution, crosses, speed and reactions, power – we worked a little bit on everything just to help him and keep him fit and ready."