ESPN have reported a slightly higher figure of £8.75m, while the Daily Mail suggests United have landed £12m from the move.
What's clear is that Hernandez has indeed signed for Leverkusen, with the German club announcing the move via Twitter on Monday night.
#Chicharito kommt von @ManUtd und unterschreibt bei der #Werkself bis 2018 || @CH14_ joins #Bayer04 until 2018! pic.twitter.com/j8PFjBcCvT
— Bayer 04 Leverkusen (@bayer04fussball) August 31, 2015