Drafted by Saskatchewan in the fourth round (23rd overall) in the 2000 college draft. O'Brian saw action in one game with the Riders in 2001 and then was traded to Edmonton along with RB Darren Davis and OL Dan Comiskey for QB Nealon Greene and RB Simon Bafoe in February of 2002. O'Brian was released by Edmonton on June 15, 2002 before the season started and signed with Hamilton in October.
| Year | Team | GP | P | Yds | Avg | Long | S |
|---|---|---|---|---|---|---|---|
| 2001 | SASK | 1 | 0 | 0 | 0 | 0 | 0 |
| 2002 | HAM | 1 | 7 | 210 | 30 | 40 | 0 |
| Year | Team | KO | Yds | Avg | Long | S |
|---|---|---|---|---|---|---|
| 2001 | SASK | 1 | 56 | 56 | 56 | 0 |
| 2002 | HAM | 0 | 0 | 0 | 0 | 0 |