Mousavi joined the Polish volleyball team in late September.
The Iranian international player was officially presented to the fans on Friday.
Tomasz Jankowski, president of AZS Olsztyn, attended the presentation.
“This is the first time I want to play abroad. I am 32 and I thought it’s the right time to experience a new club. PlusLiga is one of the top three leagues in the world, that's why I decided to play in Olsztyn this season,” Mousavi said.