He played in the NHL with the Montreal Canadiens between 1970 and 1972, and in the World Hockey Association with the New England Whalers between 1972 and 1979. Internationally Pleau played for the American national team at the 1968 Winter Olympics and the 1969 World Championship.
He participated in the NHL with the Montreal Canadiens from 1970 to 1972, and later in the WHA with the New England Whalers from 1972 to 1979. He represented the American national team at both the 1968 Winter Olympics and the 1969 World Championship on an international level.