A friend of a friend who I see occasionally works as a groundsman at anfield (he's a blue incidentally), he said last season when I saw him in the pub that they were worried all the work will fuck the pitch up.
Hes got a degree in grass growing or some bullshit & said that work so close to the pitch will prevent the continual regrowth (the vibrations of machinery with dirt & dust pollution being the main causes) as well as killing the existing grass. Like all top clubs there's only a couple of inches of growing material (soil to you & me) under the grass, with shitloads of sand for drainage, it can be very easily unsettled.
They put a plan to the club to temporarily increase the artificial percentage up to around 65/70% (it's currently about a third fake) which is how they got round the lack of air & light issue at the new Wembley (it's nearly 70% fake grass there apparently) but the club rejected that idea for whatever reason.
You're probably all asleep by now, it was a much more interesting conversation when pissed & taking the piss out of his degree. Well, until he told us how much he was paid & that he got to go to Istanbul gratis despite being a bluenose. Twat.