Gullit, a former world player of the year, AC Milan, Chelsea and Netherlands midfielder as well as Chelsea manager, was Kalou's mentor at Feyenoord.

BBC: Even if I 'm not in the groove I have to fight to stay in the team

However, they face competition for Ronaldinho's signature as city rivals and Serie A leaders Inter Milan are also reported to be interested in the former Paris St Germain player.

BBC: Ronaldinho move to Milan in doubt