The Republic of Ireland international missed the start of the season with a knee injury and suffered cruciate ligament damage while away with his country just weeks after making a return to action.
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"Darron has been a big miss for us," the Spaniard told the Liverpool Echo. "He has not been forgotten internally.
"I know when you don't play as a player you get a little bit out of the limelight but I'm very excited about Darron's contribution next season.
"He's exactly the type of midfielder we need. Gareth Barry and James McCarthy have been fantastic but we could have done with Darron being fit and ready.
"He is looking sharp. He wanted to be involved in the final game of the season but we would have been taking a little bit of a risk to do that - but I'm pleased to say he will start pre-season in great condition and ready to fight."