Apart from the stadium revenue, your sponsors are your most important source of income for your club. As soon as a sponsorship deal has expired with one of your sponsors, you will be sent a new offer.
By conducting negotiations, you will receive new offers that can be better or worse. However, you may obtain further negotiating rounds using GT Stars.

Main sponsor
Basic amount for each game - This amount will be automatically paid into your account every match day
Goalscorer bonus - You will receive this premium if one of your players leads the top goalscorers' chart at the end of the season
Title bonus - You will receive this premium if you finish the current season at the top of the league

Secondary sponsor
Basic amount for each game - This amount will automatically be paid into your account every match day
Win bonus per game - You will receive this premium every time you win a match
Goal premium per game/goal - This amount will be paid out  each time you score a goal in a match

Your sponsors also pay out GT Stars.