Although A-League clubs have restricted salaries (salary cap), the league allows each club to have two "marquee" players whose salaries are exempt from the cap, plus a number of other 'exemptions' or 'allowances' to incentivise clubs to spend in specific areas. Guest players are also excluded for up to a maximum of 14 league matches. From the formation of the league, clubs have been allowed to sign one international marquee player. From the 2008–09 season, A-League clubs have been permitted a junior marquee player; one that is under the age of 23. Now known as the 'Homegrown Player allowance', clubs can spend up to a collective $150,000 on three Australian players aged 23 or younger that have come through the club's youth system. On 19 April 2010, the A-League announced that, in addition to the international marquee and junior marquee, clubs would be allowed an Australian marquee player from the 2010–11 season. Notable marquee and guest players in the A-League have included Alessandro Del Piero, William Gallas, Dwight Yorke, Emile Heskey, Robbie Fowler, Shinji Ono, David Villa and former FIFA World Player of the Year Romário. Famous Australian Marquees include Harry Kewell, John Aloisi, Brett Emerton, Joshua Kennedy and Tim Cahill.