The surface is being treated ahead of hosting some of the Olympic Games' football matches next month as Sinclair's team bid to ensure it is in its usual tip-top condition for the tournament.
"We had the Soccer Aid game, if you remember, on 27 May and we stripped it off the next day," he told ManUtd.com. "Basically, we shaved it down to the root. It means we keep the existing grass and introduce new cultivars, which are seeds, around that."
The Olympics presents a test but the prestige of holding the event at the Theatre of the Dreams is not lost on Sinclair.
"Obviously, it's a challenge," he admitted. "It's nine games in 11 days and the way that I describe it to people is it's pretty much half of a Premier League season in 11 days. So, when you say it like that, you can see it's going to be a challenge but it's one we're all looking forward to as a team.
"We've had to slightly adjust our way of thinking with the feeding patterns throughout the summer as, from Soccer Aid to the Olympics, it's only 60 days. It's a challenge and a big event but we're ready for it, like we always are."