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According to sources, Harlan Chamberlain collapsed at his home in Lincoln, Neb. He was listed in critical condition at St. Elizabeth Regional Medical Center in Lincoln, a nursing supervisor there told the Daily News on Sunday night. Chamberlain learned the news after the Yankees' loss to the Red Sox at Fenway Park.

Chamberlain's sister called a Yankees official during the eighth inning in an attempt to reach Chamberlain, who was in the bullpen at the time.

After the game, a source said, Chamberlain returned the call, only to learn of his father's collapse.

Sources said Chamberlain broke down in tears inside the clubhouse, as manager Joe Girardi consoled him.