  XO-7b is a hot Jupiter transiting a $V = 10.52$ mag G0V-type star. The
planetary system is interesting because the linear slope in the discovery
radial-velocity (RV) data indicated a wide-orbit massive companion. In 2020 we
started an RV campaign for the system with the main scientific goal to
follow-up this linear slope, and to put constraints on the orbital period of
the companion. Furthermore, we aimed at refining the system parameters and we
wanted to probe transit timing variations (TTVs) of XO-7b in order to search
for long-term dynamical signs of the companion of XO-7b in the
observed-minus-calculated (O-C) data of mid-transit times. Apart from the
discovery RVs, we obtained and analyzed 20 follow-up RV observations and TESS
photometric data. The previously observed significant linear RV slope was not
confirmed with the follow-up RV data, where we detected only a marginal linear
slope with the opposite trend. If the announced companion really exists, the
most convincing explanation is that both RV datasets were collected near its
quadrature position. Based on the RVs we estimated the minimum orbital period,
which is $P_\mathrm{orb,min,3} \gtrsim 7900 \pm 1660$ d, and the 'minimum'
minimum mass of the companion, which is $(M_3 \sin i)_\mathrm{min} = 16.7 \pm
3.5~\mathrm{M_{Jup}}$. We did not find significant evidence of the companion of
XO-7b in the O-C dataset of mid-transit times. We can again conclude that if
the announced companion really exists, this is in agreement with previous
results that distant companions of exoplanets are only known by RV solutions.
