Warm Jupiters provide the opportunity to better understand the formation and evolution of planetary systems. Their atmospheric properties remain largely unaltered by the impact of the host star, and their orbital arrangement reflects a migrational history different from close-in objects. Warm Jupiters are known to cover a wide range of eccentricities however it is unclear which are the dominant formation pathways to explain this observation. Increasing the sample of long-period exoplanets with known radii is thus crucial. In this poster, I report the discovery of two massive warm Jupiter-size planets on eccentric orbits. Detected as single transit events in the TESS primary mission, only TIC 124029677 presents a second transit in the extended mission. However NGTS monitored TIC 257527578 and detected a second transit.Interestingly, candidates with two transits separated by almost two years present a set of discrete period aliases which enables a more efficient photometric follow-up. Radial velocity follow up was performed with several high-resolution spectrographs. I conclude with an outlook on the potential of these targets for follow-up studies of the planetary atmosphere as both warm Jupiters orbit reasonably bright host stars.