The 27-year-old Spaniard midfielder was fundamental in the Red Devils' all three honours last season, scoring two goals and adding seven assists.
New Barcelona manager, Ernesto Valverde has targeted the player as a signing he would love to make as a midfielder for the Camp Nou outfit, but United have stood firm in their resolve not to let him go, meaning that the Catalan giants will have to look elsewhere for a midfielder.
Spaniard Herrera, who featured in Saturday's 5-2 friendly win over LA Galaxy and afterwards dismissed links to Barcelona, is particularly looking forward to August's Super Cup meeting in Skopje.
Herrera also talked about his worldwide teammate Alvaro Morata who was strongly linked with United before the Red Devils signed Romelu Lukaku.More news: RuneScape Coming to Mobile With Full Cross-Platform PC Play
"Getting back into the Champions League was crucial for the club, we'll be one of the teams to beat".
United failed to reach an agreement with Real Madrid for the striker and signed Romelu Lukaku instead. "We're a strong team with a winning Coach".
"Too bad he's not with us, but I wish him well".
However, it appears as though it will be switched to rewarding key individuals in the next day or two, with The Daily Star reporting that Herrera will pen a new deal worth £200,000-a-week plus bonuses over four years.