The 24-year-old can either play in defence or midfield and has been part of the set-up for four years.
Ayari made his debut in March 2002 and scored his only international goal in the friendly win over South Africa later that year.
He was also part of the 2004 Olympic side and African Nations Cup-winning squad where he started three games and came on once but failed to play any part in the final win over Morocco.
His club career began with Stade Tunisien before a move to Turkish side Samsunspor in the summer of 2004.
Useful member of the squad though will struggle to earn a place in the starting XI.