CAMPINAS, Brazil -- Cristiano Ronaldo again wore a brace on his troublesome left knee Friday, triggering a new wave of questions over his health as his Portugal team held its final World Cup training session before departing for a crucial game against the United States. The reigning world player of the year took part in some light workouts with the first team, followed by stretching. He was smiling and appeared at ease at practice at the team base in Campinas, northwest of Sao Paulo, as he took part in a playful game of keep away from teammates. The team was set to leave later in the day for Manaus for its matchup with the U.S. on Sunday. Portugal was humiliated in a 4-0 defeat by Germany in their opener. Another loss and the fourth-ranked team in the world could be eliminated even before its final Group G game against Ghana. Ronaldo has been hampered by tendinitis and a muscle injury since before the tournament, creating plenty of speculation about how he would perform in Brazil. He was doubtful to play before the Germany game, but declared himself fit and went on to produce a subdued performance that only added to the usual drama and scrutiny surrounding the player. Team officials dismissed reports suggesting that Ronaldo could be risking his health by playing, saying they were tired of having to deny every rumour about a player many consider to be the worlds best. They noted, however, that he often plays with a brace and said hes healthy and would play against the U.S. Teammate Helder Postiga also expressed frustration over the media circus around Ronaldo. "I have already answered so many questions about Cristiano Ronaldo. Actually we speak about him every day. If I am sick of it, imagine how he is feeling," Postiga said. "If he is available enough to train with us thats probably because he is feeling well. Hes been training with us all these days and as usual he always gives his best. Hes just fine." Ronaldo has been one of the best players in the world for about a decade, and last year he even passed Lionel Messi by ending the Argentina forwards streak of winning the FIFA Ballon dOr. He has also excelled on the world stage, helping Portugal reach the 2004 European Championship final and the 2006 World Cup semifinals. The team also advanced out of the group stage at both Euro 2008 and the last World Cup, and then reached the semifinals at Euro 2012. Although he is Portugals all-time record scorer with 49 goals in 111 appearances, Ronaldo scored just twice in the last two World Cups. NHL Jerseys China .com) - Jimmy Butler made four key free throws down the stretch to lift the Chicago Bulls over the Boston Celtics, 109-102, on Friday. NHL Jerseys Outlet .J. -- Jaromir Jagr has hit so many NHL milestones this season for the New Jersey Devils that he is starting to downplay them. https://www.chinanhljerseys.us/. Rodgers was ruled out on Friday by Packers head coach Mike McCarthy. Matt Flynn will make his second consecutive start for the Packers. Cheap Adidas NHL Jerseys . - While a fast-paced offence has become more of a fixture in recent years, the San Antonio Spurs can still grind out games when needed. Wholesale NHL Jerseys China . The 29-year-old German, the 2011 overall World Cup champion, says she has decided "to end my career now.The Edmonton Oilers will be without defenceman Anton Belov for a couple weeks. Belov has a partially torn oblique muscle and isnt expected back for at leaast two weeks, coach Dallas Eakins said.dddddddddddd. The 27-year-old has a goal and six assists in 48 games with the Oilers this season. ' ' '