Milan have put Brazilian ace Ronaldinho on a strict diet, hoping he will lose at least four kilograms between now and the beginning of the season in August, according to Il Corriere Dello Sport.‘Dinho’ returned to action on Monday afternoon for pre-season at Milanello and he has been working hard and with intensity.The report suggests the player is currently overweight and both Leonardo and athletic coach Daniele Tognaccini have devised a special exercise programme for the Brazilian so he can shift the extra pounds and be ready in time for next term.Furthermore, it is suggested the player put on more weight during his summer holiday.A big season from Ronaldinho is expected this year as he will have to step up to the plate following Kaka's departure to Real Madrid.Patron Silvio Berlusconi is said to be counting on the Brazilian to lead the team in their battle for glory."Ronaldinho has been working hard during pre-season," Tognaccini told Sky Sport Italia."He has been doing specific exercises related to his physical condition. I think working with the ball is more stimulating for him."Source: Goal.com