But the Belgian defender is confident that his side can still challenge for silverware next season.
“I am disappointed because I wanted him to stay at the club,” he told Sky Sports News.
“He was fantastic for us in the last year, scored lots of goals and I am disappointed he is going, but we have to focus on the next season with Arsenal. We have to fight and I am confident we have a squad to win something.”
“We start Saturday and this is all clear now, Robin is leaving and we have to move on,” he added.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.