Neymar undergoes calf tests as Brazil prepares for World Cup match

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Neymar was back on the training field Tuesday, returning to action for the first time since he joined Brazil's World Cup squad while nursing an injured right leg. Neymar still wasn't at full speed, though, and did mostly physical conditioning at the team's training camp outside New York. The 34-year-old Neymar, playing at his fourth World Cup, has yet to join the rest of the squad in full training sessions during the team's preparations.

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Doubts over Neymar's debut at the World Cup continued Monday after the Brazil forward underwent new tests on his injured right leg. There had been hope that Neymar could return to training on Monday, but the Santos player did not join his teammates and instead went to a clinic for the tests on his right calf. The Brazilian soccer confederation did not immediately reveal the results of the tests.

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Neymar, who has been out for a month with a right calf injury, trained in uniform and joined his Brazil teammates briefly for the first time during this World Cup at the club's practice Wednesday in Morristown, New Jersey.