Brazil winger Raphinha was forced off the field with an apparent right hamstring injury during the first half of a World Cup group stage match against Haiti on Friday night in Philadelphia.
The Barcelona attacker went down after a hard run on the right wing in the 38th minute and immediately signaled for medical assistance.
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Brazil manager Carlo Ancelotti replaced him with Rayan shortly after, with the team already leading 2-0.
Initial reports from stadium journalists and Brazilian outlet Globo indicate the 29-year-old suffered a right thigh muscle injury.
The incident mirrors a similar hamstring injury Raphinha sustained on international duty last March, which sidelined him for six weeks.
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Television commentator Landon Donovan noted during the Fox broadcast that recovery for such an injury typically requires a minimum of seven to 10 days.
The player appeared visibly upset while speaking with teammate Vini Jr. and receiving treatment from the medical staff.
The medical team will conduct further diagnostic tests over the weekend to determine the exact extent of the damage.
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The injury leaves Raphinha as a major doubt for Brazil's upcoming group stage fixture against Scotland.
