The German manager added just two names to his squad in January, sealing a surprise loan deal for Queens Park Rangers centre-back Steven Caulker and bringing in Serbian teenager Marko Grujic from Red Star Belgrade.
With some fans left wanting more from Klopp's first window, questions have been raised over the transfer policy of the former Borussia Dortmund boss by some sections of the club's support.
However, Barnes, who won two First Division titles and two FA Cups in a decade at Anfield, has moved to alleviate these concerns, promising that although Klopp may not bring in big names he will add quality and depth to the Reds' squad.
He told the Express: "It’s going to be more than one or two transfers in. I think that you can see we have the basis of a good team but more importantly we’re going to trust Jurgen.
"If he brings in four or five players, even if we haven’t heard of them, and he knows they can fit into his style and strategy and what he wants to do, we have to trust him enough to do that.
"We can’t be disappointed that we haven’t signed Cristiano Ronaldo or Lionel Messi or the best players in the world. Whoever he signs, regardless of whether we’ve heard of them or not, will help Liverpool because he will know how to get the best out of them."
Liverpool were boosted on Sunday by the goal-scoring return of Daniel Sturridge to the side after injury in the 6-0 thrashing of Aston Villa, a result which leaves Liverpool in eighth place, just three points off Manchester United in fifth.
Klopp's side face a trip to German outfit Augsburg in the first leg of the last 32 of the Europa League on Thursday.