It's sounds drastic, but then you look at the squad and there are precious few outside of that trio that Manyoo fans would be gutted to see the back of.
Even Fernandes & Dalot - arguably the only two senior squad members to have played to their potential this season - would be guys you'd consider an offer for, given Bruno's age and the fact that Dalot is decent but no world-beater.
The British guys like McTominay, Shaw & Maguire are probably the ones you could move on for semi-decent fees to the likes of West Ham and maybe a big club will think they can rejuvenate Rashford (...but it'd be a sizeable risk).