A pilot tasked with flying a 'Moyes out' banner over Old Trafford says his company received the call two days ago - shortly after United went down 3-0 at him to rivals Manchester City.
Air Ads' chief pilot Chris Mustow also told ITV News' Ian Payne that, while the company had to be wary of public order issues, he was confident "we're not going to cause a riot".
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The peer told Peston on Sunday he needed to have a discussion with his partner of 20 years.
The 10K and half-marathon races take place almost exactly a year after Salman Abedi killed 22 in his attack at an Ariana Grande concert.