Aldridge told BetBrain: “Liverpool have some thinking to do in regard to the centre forward position.
“If the club are going to replace Darwin Nunez, who are they going to bring in? Will Florian Wirtz play as a false nine? For me, Alexander Isak is the player on everyone’s mind and would be the perfect addition up front.
“He’d be a superb signing, but I can’t see Newcastle letting him go, and if they did, it would be for a huge fee. I don’t know what the club’s plans are, but they need to get something sorted before the start of the season.
“Liverpool also can’t allow Luiz Diaz’s contract to run down and him leave for free - ‘no player is bigger than the club’ as they say. There’s so much happening at Liverpool right now; they don’t need another saga with a player’s contract - we all saw what happened with Trent Alexander-Arnold. If it was down to me, I’d give Diaz a new contract - I want him to stay.”