The paper had previously reported the youth graduate of La Masia's release clause is €40m - although this has not been confirmed - while Barca have no desire to negotiate.
The youngster made 47 appearances across all competition in the 2016-17 season and contributed to his team's cause with a goal and 6 assists.
Less than a week before the Premier League season restarts, Man United and Chelsea are again going head to head as the clubs battle to sign a Barcelona star.
Let's not forget, Sergi was responsible for the most memorable moment for Barcelona last season when he netter a last minute victor over PSG to complete the 6-5 aggregate comeback in Champions.
The former Atletico Bilbao boss is most likely to use new recruit Nelson Semedo in the full-back position, and even if Roberto is shifted to his favoured midfield position, he will have to fight with Andres Iniesta, Sergio Busquets, and Andres Gomes for a place in the starting lineup.
However, it has also been suggested that Chelsea and AS Monaco may be in the hunt for Roberto, who is contracted to Barca until 2019.
The potential for the Spaniard to become surplus to requirements has not only alerted United to his potential availability before the window closes, but Chelsea are also interested.