  We present FIES@NOT, HARPS-N@TNG, and<EMAIL_ADDRESS>radial velocity
follow-up observations of K2-19, a compact planetary system hosting three
planets, of which the two larger ones, namely K2-19b and K2-19c, are close to
the 3:2 mean motion resonance. An analysis considering only the radial velocity
measurements detects K2-19b, the largest and most massive planet in the system,
with a mass of $54.8\pm7.5$~M${_\oplus}$ and provides a marginal detection of
K2-19c, with a mass of M$_\mathrm{c}$=$5.9^{+7.6}_{-4.3}$ M$_\oplus$. We also
used the TRADES code to simultaneously model both our RV measurements and the
existing transit-timing measurements. We derived a mass of
$54.4\pm8.9$~M${_\oplus}$ for K2-19b and of $7.5^{+3.0}_{-1.4}$~M${_\oplus}$
for K2-19c. A prior K2-19b mass estimated by Barros et al. 2015, based
principally on a photodynamical analysis of K2-19's light-curve, is consistent
with both analysis, our combined TTV and RV analysis, and with our analysis
based purely on RV measurements. Differences remain mainly in the errors of the
more lightweight planet, driven likely by the limited precision of the RV
measurements and possibly some yet unrecognized systematics.
