The Brazil international completed a reported £142m move to La Liga giants Barcelona in the January transfer window following months of speculation.
Coutinho was linked with a move to the Catalan side in the summer transfer window but the Merseyside outfit refused to consider the sale of the attacking midfielder.
The 25-year-old handed in a transfer request but Liverpool FC refused to alter their stance and Coutinho remained at the 18-time English champions beyond the summer.
His big-money move to Camp Nou in January comes as a surprise given Coutinho is cup tied in the Champions League.
Asked about his decision to allow the Brazilian to leave Liverpool FC this month in an interview with Reds legend Phil Thompson on Sky Sports, Klopp replied:
“We had no chance to use him in the second part of the season. We all tried everything to convince him.”
Liverpool FC finished in fourth place in the Premier League table last term to secure a return to the Champions League after a two-season absence.
The Reds haven’t won the Premier League title but finished in second place in 2002, 2009 and 2014.
Liverpool FC signed four players in the summer transfer window to bolster their squad.
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