Liverpool went after Neymar for his defensive weakness in the 3-2 win over Paris Saint Germain, according to Jurgen Klopp.
Firmino came off the bench to score the winning goal at Anfield, after PSG restored parity to make it 2-2 at the 83rd minute.
And Neymar regularly failed to track runs from Trent Alexander-Arnold, with one such foray from the Liverpool right-back contributing to Daniel Sturridge’s headed opener.
Klopp revealed Liverpool deliberately targeted the PSG left wing as he knew Neymar would not follow Alexander-Arnold when the defender got forward.
“They changed a bit of the system, we expected it and didn’t think too much about it,” Klopp told BT Sport.
“Neymar on the left was not a bad idea and makes defending more difficult, we needed more focus and we felt we did really well.
“We covered a lot of yards and closed all the gaps and when we had the ball made them run and used the right wing.
“Neymar is world-class but not a defender so we tried to do that.”