Liverpool spent most of the summer fending off Barcelona's interest in Brazilian international Coutinho, rejecting a host of bids to keep the playmaker at Anfield despite his desire to make the move to Catalunya.
Ernesto Valverde's men still have money from selling Neymar to Paris Saint-Germain in a world-record deal despite signing Ousmane Dembele from Borussia Dortmund – and they could look to spend it on one of Coutinho's team-mates.
The Mirror report that Barcelona have turned their attention to Liverpool superstar Sadio Mane, who is currently suspended following his controversial red card against Manchester City last weekend.
Mane, 25, excelled with both Red Bull Salzburg and Southampton before earning his move to Liverpool last summer, where he has blossomed into one of the Premier League's most dangerous attacking players.
The Senegal international hit 13 goals and five assists in the Premier League last season, whilst he's even found the net three times in four games this term as his blistering pace, incisive approach play and superb finishing have made him vital to Jurgen Klopp's style of play.
Liverpool won't want to lose Mane after fighting so hard to keep Coutinho, but with Barcelona – as well as Juventus and Real Madrid – allegedly keen on the winger, the Reds may face a battle to keep him in 2018.
The report adds that Liverpool ace Coutinho now fears that his dream move to Barcelona will never materialise, and watching one of his team-mates earn that switch could be all the more galling for him, though Liverpool will naturally fight tooth and nail to keep both players for the long-term.