Munir, 21, has been on loan at Valencia all season after finding himself down the Nou Camp pecking order.
His path at Barca has been blocked by Luis Suarez, Neymar and Lionel Messi – and he has no chance of starting for the Catalan giants.
But the Spain international has found opportunities easier to come by at Valencia, where he has featured in 27 La Liga games.
Barcelona wages revealed: Which stars earn most? Fri, March 24, 2017
Click to reveal every Barcelona player's weekly wages, according to Totalsportek.com
Play slideshow GETTY 1 of 23
Click to reveal every Barcelona player's weekly wages
Valencia are languishing down in 12th but Munir, who has scored six goals, is seen as one of the few bright points of an otherwise disappointing campaign.
Marca say he is now set to become a permanent signing after impressing sporting director Jose Ramon Alesanco.
Valencia can keep him at the club if they pay a £10.1m fee – along with the player agreeing to sign.
Barcelona could sell Munir El Haddadi (left to Valencia this summer
El Haddadi (right) played against Barcelona last month
Get Quotes on Home Insurance
Valencia think they can sign El Haddadi for £6.7m
But Valencia chiefs are hopeful of lowballing Barca and getting him for less.
They see a £6.7m fee – plus sell-on and first option clauses – as a way of getting a deal done.