I defrosted chicken on Saturday. Can I eat it for lunch on Monday?
If you defrosted it correctly (How to quickly and safely defrost chicken?), then yes. You can cook and serve it 2 (even 3 or 4) days later.
As long as you cook it properly 165 F according to foodsafety.org you would have no problems. If you plan to eat it raw or rare, contamination may occur (this doesn't mean it's a Death sentence and you'll get sick for sure, but you have to know your risks)