I did wonder at his involvement so far. Diaby has gone straight in as a starter. Torres has too, albeit due to an injury. Zaniolo is only here 5 minutes. But so far Tielemans doesn't seem to be troubling anyone for a starting place. Maybe that's what Emery brought him in for though, to be an impact sub?
I'd assume several players will see more playing time after the break when the matches start stacking up.