De Jong is set to return for pre-season training next week after being granted an additional summer break due to his involvement with the Netherlands last month.
United remain locked in talks with La Blaugrana over a possible deal but de Jong wants to remain in Catalonia ahead of the 2022/23 season.
The former Ajax star is likely to be required to take a wage cut to stay at the Camp Nou despite the speculation.
According to reports from Diario Sport, the 25-year-old has a ten point plan to reject United.
Amongst the reasons listed are personal factors including his new house purchase and engagement, alongside his dream of establishing himself as a star player for his dream club Barcelona.
From United’s perspective, he wants to play Champions League football, and he has a lack of faith an immediate turnaround at Old Trafford, under his former boss Erik ten Hag.