Liverpool manager Jurgen Klopp insists Philippe Coutinho is not for sale following a bid from Barcelona.
The Mail report that Barca have tabled an offer worth £72million for Coutinho, who they have identified as a long-term replacement for Andres Iniesta.
Coutinho, who scored 13 Premier League goals in 28 starts last season, signed a new Liverpool contract in January, committing to the club until 2022.
At the time the player described playing for Liverpool as "a great honour" and Klopp believes it is crucial the current squad stays together to progress.
Asked if the 25-year-old was not for sale, Klopp told a press conference in Hong Kong on Friday: "Yes, that's what we can say. But that's not since this morning or yesterday, I'm not sure if it was different at any time. So, yes.
"I'm not surprised that any club is interested in players, if it is like this. A few people obviously see that Liverpool has a few good players. That's how it is.
"But a very important message, maybe - we are not a selling club.
"We believe in working together, we believe in development together. We believe in using the basis. We want to work together, we want to make the next step together and for this we need to stay together. That's how it is."
Liverpool sold Luis Suarez to Barca for £75million in 2014, but will have to trump that fee significantly to force the Reds to rethink their stance.
