The Liverpool is set to be backed by the board in the transfer market this summer and Klopp wants to build a title-chasing side.
Barnes thinks Klopp has done the business at Anfield with the weakest squad in the top six, and now he needs go out and bolster his options.
The former Anfield ace thinks it will be a busy summer at the club and hopes they will be in position to mount a serious title challenge next season.
Jurgen Klopp has been backed to invest heavily this summer by club legend John Barnes Roberto Firmino in light training as Liverpool try out novel defensive tactic Fri, April 14, 2017
Express Sport brings you the best pictures from Liverpool's latest training session ahead of their Premier League clash with West Bromwich Albion on Sunday (1.30pm)
Play slideshow Getty Images 1 of 19
Liverpool have been hard at work in training ahead of their clash with West Brom
When asked where Liverpool need to strengthen, Bonus Code Bets ambassador Barnes said: “Wherever we can get quality.
“You can look at different areas but if we get the chance to sign a good centre-forward, although we’ve got good centre-forwards, you get him.
“There’s no particular areas, but I think from a defensive point of view they have to look to get something better.”
John Barnes will back Jurgen Klopp if he opts to keep Simon Mignolet
John Barnes thinks Liverpool's squad needs investment [BONUSCODEBETS]
Liverpool are expected to bring in defensive reinforcements and possibly a goalkeeper this summer after struggling at the back but Barnes insists he is confident in Klopp’s choices.
Get Quotes on Home Insurance
“He’s the only one who knows (what the team needs).” Barnes added.
“He seems to like the goalkeepers and if he likes them then I trust him, and there’s the centre-back situation so there’s always going to be speculation about all positions, particularly as we do concede goals from set pieces, but as I said Jurgen Klopp is the right man to make the decisions and if he sticks with Mignolet then I support him 100%.”