sentences:  By the end of 2010, and the beginning of 2011, Milan had faced an injury crisis that had seen players Andrea Pirlo, Massimo Ambrosini, Filippo Inzaghi, Gianluca Zambrotta, Kevin-Prince Boateng, Daniele Bonera, Luca Antonini, Alexandre Pato and Alessandro Nesta all injured.The team would then be enforced during the winter transfer period with the signings of Antonio Cassano, Mark van Bommel, Urby Emanuelson, Dídac Vilà and Nicola Legrottaglie.The signing of Cassano had also paved way for the exit of Ronaldinho, who joined Rio de Janeiro-based side Flamengo in Brazil.