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We report on the confirmation and follow-up characterization of twolong-period transiting substellar companions on low-eccentricity orbits aroundTIC 4672985 and TOI-2529, whose transit events were detected by the TESS spacemission. Ground-based photometric and spectroscopic follow-up from differentfacilities, confirmed the substellar nature of TIC 4672985 b, a massive gasgiant, in the transition between the super Jupiters and brown dwarfs massregime. From the joint analysis we derived the following orbital parameters: P= 69.0480 d, Mp = 12.74 Mjup, Rp = 1.026 Rjup and e = 0.018. In addition, theRV time series revealed a significant trend at the 350 m/s/yr level, which isindicative of the presence of a massive outer companion in the system. TIC4672985 b is a unique example of a transiting substellar companion with a massabove the deuterium-burning limit, located beyond 0.1 AU and in a nearlycircular orbit. These planetary properties are difficult to reproduce fromcanonical planet formation and evolution models. For TOI-2529 b, we obtainedthe following orbital parameters: P = 64.5949 d, Mp = 2.340 Mjup, Rp = 1.030Rjup and e = 0.021, making this object a new example of a growing population oftransiting warm giant planets.

A long-period transiting substellar companion in the super-Jupiters to brown dwarfs mass regime and a prototypical warm-Jupiter detected by TESS