| 1. Jeffrey made his first international appearance for the SLCB President’s XI against Pakistan in June 2015. |
| 2. He became the 168th player to represent Sri Lanka in ODIs, where he had a debut match that resulted in conceding 34 runs in 2 overs and scoring 7 runs not out. |
| 3. His inaugural ODI wicket was against Tom Latham from New Zealand during the third ODI match at Saxton Oval. |
| 4. In January 2016, he achieved his first T20I wicket by dismissing New Zealand's Corey Anderson. |
| 5. Jeffrey was included in the squad for the 2016 ICC World Twenty20 as a replacement for the injured Lasith Malinga. |
| 6. He was signed by the Colombo Kings for the inaugural edition of the Lanka Premier League in October 2020. |
| 7. In March 2021, he contributed to Sinhalese Sports Club's victory in the 2020–21 SLC Twenty20 Tournament. |
| 8. In August 2024, he gained recognition after taking 6 wickets in an ODI match against India, securing a win for his team. |
