It's limited to whoever they can get the most publicity by criticizing, and who's least likely to fund their reelection, I would guess. To be fair to other sports people like golfers and tennis players, I don't think they're usually salaried, so they probably lose money simply by not being able to play. Nor are they likely to be claiming government aid to pay lower-paid staff. And that's the real issue here. If Sheikh Mansour puts his own money in to cover the lost income (no doubt UEFA would oppose such a heinous act) then it's none of the government's business whether or not our players take a pay cut. But if the club starts to claim handouts from the government, then it's only right that their highest-paid staff do their bit too.
But yeah, it's curious that no-one from the government seems to have criticised companies like British Airways who have given their pilots a 50% pay cut and 2 weeks unpaid leave while their CEO (and presumably the rest of management) remains on full pay. He actually did take a 100% pay cut in the end, but this only happened after media criticism, not criticism from anyone in the government, who seem to be far more careful about which people they publicly attack. John McDonnell (surprise, surprise) seems to be the only high-profile politician to have publicly attacked CEOs for not taking a pay cut in this time.