The Dutchman insists there is much more to come on a personal and collective basis.
"Training sessions have been very good and with all the guys it's a process," he told MUTV. "I have to get used to them, they have to get used to me, because I've still only been here a week. We have all the time in the world. I don't want to rush into things.
"I'm not one hundred percent match fit, it's my first game of the whole pre-season in over a month so I have to get fitter and fitter. I'll get fitter by playing games, basically, so I still need a couple of weeks before I'm fully match fit."