Coworker is not much of a team player

Coworker is not much of a team player

An employee recently (re)joined our team. Long story short, he left the position over a year ago on secondment to another area and recently came back because his secondment ended. Although he was actively looking, he wasn't able to get another job. During his secondment, his position was filled by someone else who I worked really well with. She did amazing work and developed a good reputation. However, by the time my current coworker came back to our team, she was moving on to different position.

Well, my current worker and I are now working on a big project together (our manager is the lead). I am struggling a bit because I find that my coworker just does things on his own and sort of gets ahead of himself. This is a multi-stakeholder project and we should be making decisions on how we coordinate and approach the work together (with all stakeholders not just him and I). He seems to be excluding me from certain things sometimes. It makes me miss my old coworker because her and I used to work together collaboratively and plan things together. Our skills also complimented each other so it was great. With my current coworker, we seem to clash sometimes with the way we approach certain project aspects and I am not sure how to deal with this. How do I deal with this situation? I also feel like I want to tell him he needs to be more of a team player as he tends to work independently.. He may be trying to prove himself with this project too since with his secondment he said he felt underutilized and unappreciated.