Philippe Coutinho scores a screamer against Leicester
Coutinho has been heavily linked with a move away from Liverpool this summer as Barcelona continue to show an interest in the Brazil international.
Barca are said to have made a £72million bid for the 25-year-old playmaker earlier this month as they prepare for life without Paris Saint-Germain target Neymar.
But Liverpool are desperate to keep hold of Coutinho and swiftly knocked back the La Liga side's offer.
However, former Liverpool winger Barnes reckons the Reds could be fighting a losing battle.
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John Barnes fears Philippe Coutinho will leave Liverpool
Something isn't quite right with Philippe Coutinho at Liverpool
John Barnes
Coutinho bagged Liverpool's winning goal to help the Reds to the Premier League Asia Trophy on Saturday, but the Brazilian chose not to celebrate.
And Barnes has suggested Coutinho's reaction to scoring against the Foxes was proof he wants to leave Anfield this summer.
"You could tell by the way he reacted after he scored, with no celebration or anything, that something isn't quite right with Philippe at Liverpool," the Reds hero told ESPN FC.
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"It would be great if Liverpool keep him, but if he goes, I wish him all the best."
But Barnes is confident Liverpool manager Jurgen Klopp has the quality in his squad to cope without Coutinho next season.
“Jurgen Klopp still has a good squad, so he will maximise the potential of the squad without Coutinho," Barnes added.
“We'd like him to stay, but if he goes Klopp will still find a way of being competitive."