David Green arrived in the CFL in 1978 after an all-star career at Edinboro University in Pennsylvania where he was an honorable mention All American. In his first season with the Alouettes he made an impact with a 5 yard per carry average. His role would expand in 1979 as he would team with quarterback Joe Barnes in leading the Als offence. He would post dominant totals with 1,678 yards rushing and 11 touchdowns. He would be named the Leagues Most Outstanding Player as well as the Offensive Player of the game in the 1979 Grey Cup a 17-9 loss to the Edmonton Eskimos. He would total 149 yards rushing in the loss.
After being crowned as the League's best in not only the 1979 regular season but the Grey Cup, Green had a bitter battle with the Alouettes over his contract. He would eventually sign with Montreal in time for the 1980 season but his totals would never again approach their MOP level. After a disappointing season in 1980 where he saw his role expand to more of a receiver the Pennsylvania native grew unhappy in La Belle Provence.
Nelson Skalbania purchased the Montreal Alouettes in 1981 from Sam Berger and set out to drastically change the make-up of the team. He
targeted a well known NFL free agent to lead his overhaul and bring attention to the Alouettes. The player he targeted was Los Angeles Rams quarterback and free agent Vince Ferragamo. The negotiating rights for Ferragamo were held by the Hamilton Tiger Cats. Skalbania would ship Green and another productive Alouette in receiver Keith Baker to the Tiger Cats to obtain Ferragamo's rights. It was a steep price to pay but Skalbania landed his big fish. Ferragamo would be a disaster in Montreal barely lasting the 1981 season while David Green would also struggle with his new team in Hamilton. Green struggled with injuries and would conclude his final season in the CFL with disappointing totals in 1981.
Green would briefly surface in the NFL with the Cleveland Browns in 1982 before retiring from pro football.