According to Chris Haynes of Yahoo Sports, Butler plans to play. He missed the second half of Game 3 due to the injury, while Williams missed the entire contest.
Smart and Tatum suffered their injuries during Game 3, leaving the court momentarily before returning a short time later. Miami has been listing Lowry, Tucker, Vincent and Strus on its injury report for quite some time, though Tucker suffered his knee injury this series. He was previously dealing with a calf strain.
Despite missing Butler in the second half, Miami held on to win Game 3 and take a 2-1 series lead. Boston also missed Williams, one of the league’s best interior defenders, as Bam Adebayo finished with 31 points. A Boston win on Monday would tie the series 2-2, while a loss would mean the Celtics have to head back to Miami facing a 3-1 deficit and possible elimination in Game 5 on Wednesday.