The club has issued this statement: 'United Manager Martin Ling is currently being treated for a debilitating illness. He is receiving specialist care and, while we are able to report that his is making some progress, it is anticipated that Martin will be away from work for several weeks.
'Club and the League Manager's Association are fully supportive and are looking forward to his return.
'In the meantime, United officials have held talks with assistant manager Shaun Taylor and we have agreed to actively seek an experienced coach to help Shaun with the running of the team. This process has already begun in earnest.'
More top news
There's been yet another delay in the case of the two men accused of causing the death of North Devon teenager Scarlett Keeling.
The number of cases of the waterborne disease cryptosporidiosis now stands at 176 - that's four times higher than normal.
Two people have been pulled from a car after it plunged 20ft into a lake and overturned.