Billiat says Serero - who moved to Dutch side Ajax Amsterdam in May last year for a reported R25 million transfer fee - has proved hard to replace for the Urban Warriors, who finished a disappointing ninth on final log standings of the 2011/12 season. The previous season had seen Ajax taking Pirates to the sword in the League title chase, before narrowly losing out to the Soweto-based giants (on goal difference) on the final day of the fixtures. Serero scored 10 League goals in that campaign during an impressive season that saw him winning an unprecedented four trophies at the PSL awards as well as being voted the KICK OFF Footballer of the Season by readers of the popular magazine. "Yes, Serero was important to the team and his departure affected our performance during last season," Billiat tells KickOff.com. "He is a team player and we were able to combine well while playing with each other. It is such qualities that we missed. We are not happy with the way we performed and the challenge for all of us is to do better," adds the 21-year-old player, who scored 8 League goals for Ajax last season. "We have to focus all our efforts on doing much better during the upcoming season where the priority will be to win as many trophies as possible." While Billiat has attracted the interest of both Mamelodi Sundwons, Ajax Cape Town chief executive officer George Comitis has vehemently pointed out that the Zimbabwean is not for sale. Billiat is contracted to Ajax until 2014. "I do not want to say much about that (attracting interest from Sundowns and Chiefs). I am concentrating on my career here at Ajax," says Billiat, who is on record stating he will only consider leaving the club when a European offer comes his way.