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 played professional hockey for the Montreal Canadiens in the NHL from 1970 to 1972, and then for the New England Whalers in the WHA from 1972 to 1979. He represented the United States national team at both the 1968 Winter Olympics and the 1969 World Championship.