We might be picking up as much as 50% of wages which would be 8M - would still be an 8M saving on having them all molding away at FF. If we're subsidizing wages, Brands must be looking for a transfer fee.
Of those five the only one I can see sticking around is Martina. Yes, he's mostly awful, but we could need him in an injury/suspension crisis.
Niasse, Mirallas (and I expect Martina) only have until June 2020. Bolasie and Tosun until Jun 2021 and 2022 respectively.