My work

The planning of my project is delayed for many reasons:

1. We have very few people in our team
2. Time to finish first phase of project is short
3. There are many funcionalities to analyze
4. We had two people sick

Now, the team is complete and this week I need to analyze all the rest to make the analysis document and send it to the client for your revision and approval.

In #3, "functions" is better.  In #4, "Two team members missed work due to illness."  may be a better way to say it.