Bellers can play on for four years.
Bellamy's Dutch fitness coach, Raymond Verheijen, who the striker pays out of his own wages, believes the player can thrive following his move to Cardiff City.
Bellamy joined the Bluebirds on a season's loan from Manchester City in August nursing a knee problem, and admitted later he was very close to surgery.
However, the striker brought with him "periodisation" coach Verheijen to the Welsh capital, and following close scrutiny he is confident Bellamy can extend his playing career.
Verheijen, 39, believes "explosive" players like Bellamy, with fast-twitch muscle fibres, should follow an individual, specialised programme - part of the periodisation approach to smarter training - to keep them fresh and prevent overtraining.
"The medical staff at Cardiff are doing a great job," said Verheijen. "If you look at his knee in August... he can play every week now and he can train. If he plays one game a week and we keep applying his approach he can continue playing.
"Freshness is the crucial factor in football. Explosive players need more recovery time. Usain Bolt will do a sprint and then he rests for 10 minutes. Everybody judges that he is lazy, but he has so many fast twitch fibres he needs that rest - you need more recovery time.
"That is why Arjen Robben had the best season at Bayern. We spoke with the people at Munich and they reduced the volume of training."
Wales captain Craig Bellamy