Divock Origi has struggled for opportunities in the Premier League this season but he has shown his worth to Liverpool boss Jurgen Klopp.
Despite being linked with Premier League rivals Manchester United, Liverpool legend Aldridge wants to see Serie A star Koulibaly at Anfield.
The Borussia Dortmund and United States youngster has been compared to former Liverpool playmaker Philippe Coutinho.
Liverpool are still unbeaten in the Premier League this season.
Danny Ings has joined Southampton on loan from Liverpool in the summer transfer window.
Liverpool's star players will be big targets for many this summer.
Jurgen Klopp's Liverpool are the top scorers so far in this season's Champions League.
Jurgen Klopp’s Liverpool lost against Swansea City in the Premier League on Monday.
The Leicester City winger has been linked with a move to Liverpool.
Sam Allardyce earned an unlikely point as Everton drew 1-1 against Liverpool on Sunday.
Aldridge sees that it could be a tricky game for Liverpool on Saturday, while the Reds will hope there is no slow start like after the last international break.
The Brazilian has been touted as a solution to Liverpool's centre-back problems. Could he emulate the Barcelona man and make the transition?
The Liverpool icon believes the 23-year-old could end up saving the club a fortune.