Am sure they could; but players, being such prima donnas, wouldn't be at all happy and would have their agents lining them up for a move as soon as things get back to normal. 

Move to where though? Even Messi has taken a trim

Have u ever seen a footballer employment contract?  They are basically top notch if not written on a packet of JPS.  Ask harry redknapp about force majeure and he'll start talking about Ultravox being kept of Number One by Joe Dolce.

They are deemed assets which complicates it i think?

Harry probably had special clauses in his contracts to pay for Rosie's dogfood.

Aren't they all set up as Ltd companies and so self employed, or is that just for non playing related income