A new colleague started with us in July. He is more senior than me and I'm reporting into him for a big deadline we have on Thursday.
For the deadline on Thursday, the project is split into 4 parts. I took the most difficult part first and asked him to take the easiest. He said he had it complete so I asked him to move onto another task.
When I was finished my part, I had to move on to his parts to complete the next step. I saw, for both parts, he missed out huge parts of them. He didnt complete these sections, he didnt mention that he needed any help on the bits he missed out. As a result I worked 12+ hour days yesterday and today to complete his parts. He logged off at his usual time after 7.5 hours.
Tomorrow he has to work on another part of the project (I dont have time to do it myself) and I just know when its reviewed it will be incomplete and full of holes. I actually fear we could miss the deadline which is really not allowed to happen.
I'm thinking of mentioning it to my manager in the morning, just to flag that I have concerns over meeting the deadline,but then I'd have to explain about new colleague and how I cant trust him to do anything? (And how he doesnt seem to realise how important these deadlines are). How should I bring it up? 