Fellaini, who retired from professional football in February, played for United between 2013 and 2019, scoring 22 goals in 177 appearances and winning three trophies.
The 87-cap Belgium international will be on punditry duty for the friendly with England at Wembley tonight (Tuesday), as he decides where the next step lies.
Earlier this month, Marouane was interviewed by Helen Evans and Sam Homewood and he admitted that his first campaign at the club, under David Moyes in 2013/14, was the most difficult season of his career, following a big-money move from Everton.
United, who were reigning champions, finished seventh – our lowest league position since 1990 – while Fellaini was restricted to 12 Premier League starts.