turkce denir nasil...

he is also a supporter of...  this is when talking of a football team

O ...´yı tutuyor. O .... taraftarı.

For an axample: He´s also supporter of Beşiktaş (its random example, i didnt mean anything) So it means "O da Beşiktaş´ı tutuyor./ O da Beşiktaş taraftarı." 

i hope it can be helpful. It was brief.

O ayrıca (bir) x li (e.g. galatasaraylı-fenerbahçeli-beşiktaşlı-liverpoollu-barcelonalı)

O ayrıca (bir) x taraftarı.

thank you both for your quick replies