Oxlade-Chamberlain joined Liverpool from Arsenal on transfer deadline day last August for a reported £35million fee and hit a rich vein of form after the turn of the year.
He scored five times in all competitions, including a superb long-range strike in the Champions League quarter-final win over Manchester City.
It is typical of Ox that he didn t want the news to overshadow the end of the season and, to be quite honest, we thought we could wait and tell people at an appropriate time, Klopp added.
His surgery – which he had on the day of our second leg in Roma – has been completely successful and his recovery has started superbly well.
But the truth of the matter is that we are preparing this season knowing he will not be with us on the pitch for competitive matches for the majority of it. If we do see him back this season it will be a bonus.
Liverpool have already bolstered their midfield during the close season, with Naby Keita completing his pre-arranged switch from RB Leipzig and Fabinho arriving from Monaco.
Switzerland international Xherdan Shaqiri, who joined from Stoke City last week, provides an additional wide attacking option – another of the roles Oxlade-Chamberlain previously filled.
Klopp s men open their Premier League campaign against West Ham on August 12.