We are not going to get anything like £20m, that is as plain as a pikestaff - have you watched him play for the last 3 months?
Leaving that aside, if we get relegated, sure we can put some player transfer proceeds into facilities because we will have a revenue large enough (possibly one of the largest in the division) to allow us to have a competitive playing budget. But if we stay up we cannot repeat the mistake of last season. Unless there is new investment, any transfer fees in have to be ploughed back into the playing budget otherwise next season is going to be a disaster.