"Great players will always leave great clubs, that's happened in the past and will in the future," said the Liverpool boss.
'It’s the task we face. I don’t know what happened with Torres, but times move on and we now have one of the best strikers in the world with Luis.
"It's up to us to add players that can help support Luis and move us on.
"I have had great support from Luis since I've been here. He has really bought into what we are trying to do and our objective has to be to keep the best players.
"I am safe in the knowledge that Luis had the chance to go in the summer. There was probably no better time for that, with a new manager coming in.
"Luis could have had an excuse to go but, having spoken to him at length, he committed to stay.
"He's in his most productive period. Luis has scored 10 goals so far and it took him until February last season to get to that many.
"I wouldn't swap him for anyone. This is a guy whose energy is relentless - he is a defender's nightmare.
"We have one of the best strikers in the world in Luis and we are very grateful for that.
"He's up there in that one per cent of world-class strikers and there's no team in the world that wouldn't want him."