Each time you unlock new sponsors, visit the Career Mode shop to purchase fresh logos and gear from them. More importantly, visit the shop to purchase upgrades for your fighter’s attributes and skills—this is vital to your fighter’s continued growth and development.
Stat upgrades are particularly expensive, so don’t blow your Cred during your career—spend it wisely and buy the upgrades you need at the right time to continue to gain maximum benefit from each pre-fight training session.