#1 Adam Lallana
Adam Lallana had a good start to his Liverpool career but the Englishman has found it difficult to obtain a regular place in the Starting XI since the arrival of Sane, Salah and Firmino. The 31-year-old made just 13 appearances in the Premier League this season and a major reason for the reduced playing time has been due to Lallana's injury problems.
It is unlikely that Liverpool could offer sufficient game-time to the Englishman next season and hence it would be in the best interests of the player to leave the Premier League giants. For Liverpool, Adam Lallana can only be a squad player and it would help them more if they can try out a youngster instead of a 31-year-old player.
Lallana is definitely a good player and he would definitely find takers across the Premier League. Hence, Liverpool must sell the attacking midfielder in this transfer window.