Liverpool manager Jurgen Klopp says it is "clear we have to do something in the summer" amid his side's struggles this season.
The Reds were beaten 5-2 by Real Madrid on Tuesday in the first leg of their last 16 Champions League tie.
Liverpool are also eighth in the Premier League - albeit with games in hand on some of their rivals - during an inconsistent campaign.
"We know we have to improve and change things and we will," said Klopp.
"We cannot do it now but it's already clear that we have to do something in the summer.