Al Jazira coach Walter Zenga believes the club?s younger players need to adopt a more professional approach if they are to fulfil their potential. He was substituted during the second half of Jazira?s 2-1 AFC Champions League defeat to Al Shabab Riyadh on Wednesday with cramp, and Zenga feels youngsters in the UAE do **t do e**ugh to prevent such niggling problems. Zenga, who also had a good track record of blooding youngsters while at Al Nasr, added: ?For me, the youngsters if they have quality [they will] play.