See Key for column definitions.
| Team | Competition | Starts | Subs | Subbed | Total | Mins | MPG | Rating |
| Leiria | Taça de Portugal | 0 | 0 | 2 | 3 | 90 | 30.0 | 6.60 |
| Leiria | Portuguese Liga 2 | 0 | 1 | 6 | 15 | 579 | 38.6 | 6.83 |
| Totals | | 0 | 1 | 8 | 18 | 669 | 37.2 | 6.79 |
Key to column names
See Key for column definitions.
| Team | Competition | Appearances | Goals | GPG | MPG | Assists | Shots | On T | Off T | SPG | Dribbles | Passes | Acc | Fouled |
| Leiria | Taça de Portugal | 3 | 0 | | | 1 | 0 | 0 | 0 | N/A | 7 | 29 | | 0 |
| Leiria | Portuguese Liga 2 | 15 | 1 | 15.0 | 579 | 1 | 7 | 4 | 3 | 7 | 16 | 129 | | 6 |
| Totals | | 18 | 1 | | | 2 | 7 | 4 | 3 | 7 | 23 | 158 | 0 | 6 |
Key to column names
- GPG
- Goals per game
- MPG
- Minutes per goal
- SPG
- Shots per goal
- On T
- Shots on Target
- Off T
- Shots off Target
- Acc
- Accurate passes
| Team |
Competition |
Appearances |
Conceded | Saves | Tackles | Blocks | Interceptions | Duels Won | Duels Lost | Fouls Committed |
| Leiria | Taça de Portugal | 3 | 0 | | 1 | 0 | 1 | 7 | 4 | 1 |
| Leiria | Portuguese Liga 2 | 15 | 0 | | 4 | 0 | 3 | 26 | 32 | 5 |
| Totals | | 18 | 0 | 0 | 5 | 0 | 4 | 33 | 36 | 6 |
The total yellow and red cards received by J. van der Gaag in each competition are shown below.