Has Ronaldo's season already ended? © EuroFootball.com

The celebration of the Italian club's qualification for the UEFA Champions League final was shaken by the news that Brazilian forward Ronaldo has dropped out of the lineup due to muscle problems and may not be able to play for about a month.

The 30-year-old footballer, since leaving Real Madrid in January and moving to Italy with Milan, signed a contract until the summer of 2008, had not experienced any serious injuries.

At the end of Friday's training session, the player suffered a thigh injury and the official Milan team website announced that he will definitely not participate in Sunday's match against Fiorentina.

However, the Italian media claims that the Brazilian's injury could be quite serious, and for this reason Ronaldo may not be able to play for the rest of the season.

Over the next few days, he will undergo tests, and if it turns out that he pulled a thigh muscle, then the player who has scored the most goals in planetary competitions will not be able to play for several weeks.

For Milan, who crushed Manchester United 3-0 in the UEFA Champions League second leg match on Wednesday and reached the final, the loss of Ronaldo is a huge problem, as the club is in 3rd place in the Serie A standings.

Having joined the Milan team in January, Ronaldo has already scored seven goals in the Italian championship, but he cannot help the Rossoneri in European tournaments because he has already represented Real Madrid this season.

It is believed that his fellow countryman Ricardo Oliveira will take his place in the attack, while Alberto Gilardino and Filippo Inzaghi will be given the chance to rest.