Koula will bring up his 100th NRL game in Manly's must-win clash with the Dolphins on Friday night, having turned into one of the sport's strike outside backs. Koula also believes he is still just scratching the surface after four years in the NRL, having put on more weight and matured mentally in the past two years in particular. "In my career and where things stand, I'd say I'm kind of striving towards being the best centre in the game," Koula told AAP. "I'm not closing down the idea that I could play another position, especially being fullback a little while down the track. "But I'd say my main goal right now is just nailing down as a centre and being one of the elites."