Company overtime policy - is this OK?

Hi guys,

My company has recently introduced a policy whereby if you take a day off sick between Monday and Friday, there is no chance for you to have overtime opportunities on a weekend.

Although I accept that overtime is given at their discretion, tying it to sick days seems a little harsh when people can be genuinely sick sometimes. It is not a highly paid job and those who do the overtime, need it! What do you guys think? Many thanks