Rusney Castillo will undergo a physical on Saturday with the Boston Red Sox, presumably making his $72 million contract official.

Castillo is believed to be receiving $500,000 for the remainder of the 2014 season, the first in his seven-year, $72.5 million pact.

Rob Bradford of WEEI reports that Castillo's contract includes a limited no-trade clause.

Ken Rosenthal reports that the contract will be heavily backloaded. By structuring the contract as a seven-year deal, however, the Red Sox will gain a break on luxury tax implications.