| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| 2009 | Premier Division | 2 | — | 0 | — | — | — |
| 2010 | Premier Division | 26 | — | 2 | — | — | — |
| 2010 | First Division (Ireland) | 1 | 90 | 0 | 0 | 0 | — |
| 2011 | First Division (Ireland) | 19 | — | 3 | — | — | — |
| 2012 | First Division (Ireland) | 16 | — | 0 | — | — | — |
| 2013 | First Division (Ireland) | 13 | — | 1 | — | — | — |
Domestic league competitions only (SportMonks sub_type='domestic'); national-team, continental and cup competitions are excluded. Classification resolved by league id against the canonical leagues index. G+A/90 computed from minutes actually played.
Figures computed from the GioScore season-stats database · as of 2026-09-03
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Salthill Devon | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 |
 Mervue United | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 |
 Elfsborg | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
 St Patrick's | 1 | 0 | 0 | 1 | 0 | 0 | 1 | 0 |
 Hertha BSC | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
 Sporting Fingal | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
 Olimps / RFS | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
Derek O'Brien logged 13 appearances in the 2013 First Division (Ireland).
Split by competition, the league record covers 2 domestic leagues: First Division (Ireland) (49 appearances, 4 goals) and Premier Division (28 appearances, 2 goals). In 1 of the 6 campaigns on record he played at least 25 league games. His busiest three-season stretch was 2010–2012: 62 league appearances, 21 a season.
