The Scottish international midfielder is to continue his preparations for 2011/12 back at the Reds' Carrington headquarters, having missed the tail-end of the last campaign due to illness.
A club spokeswoman told ManUtd.com on Saturday afternoon: "Darren will remain at Carrington to undergo an individualised conditioning programme, given he missed a large proportion of last season.
"This will help him catch up fitness-wise with the rest of the squad. We tried to accelerate things but we want to give him the best opportunity to be fully fit for the new season. We feel a reduction in the amount of time Darren spends travelling will help him achieve this."
United have named a provisional 21-man squad for Tour 2011, which commences in America on Monday.