Dean G. Skelos, the leader of the New York State Senate, and his son are expected to be arrested on federal corruption charges next week, according to people with knowledge of the matter.

The expected arrests, coming roughly three months after federal bribery and kickback charges led Assemblyman Sheldon Silver to step down as speaker, would signal an extension of the investigation into allegations of political corruption in Albany, and would almost certainly further upend the legislative session.

It is not known if Mr. Skelos, a Republican from Long Island who was first elected to the Senate in 1984, will resign his leadership post as did Mr. Silver, a Manhattan Democrat, but he is sure to face questions about his ability to lead the chamber in light of his expected arrest.

The charges against Senator Skelos, 67, and his son, Adam, 32, are expected to be detailed in a criminal complaint and are likely to include conspiracy, extortion and solicitation of bribes, one of the people said. The charges could be announced as early as Monday.