If u want to start playing Blitzball after the tournament then there are four really good players u should recruit at the Luca stadium.

1) Wedge, near the steps leading towards the stands.
2) Jamal, sitting on a bench in the area with the cafe.
3) Zev Ronso, standing in doc 5.
4) Zalitz, sitting on a bench near the place where u can purchase movie spheres.

Wedge is an excellent forward, he has a shot of 17.
Jamal is a perfect goalie since he has a catch of 14.
Zev Ronso is a strong Midfielder.
And Zalitz is a great defender.

Another good player u should get is Ropp, he is an excellent defender. He is at the Al Bhed shop on the Mhi'ghen Highroad.