2018 was a breakout year for Jennings, with the winger making his Eels debut and playing 20 games for the club.
Jennings will be looking solidfy his position in the Eels backline next season but will face stiff competition from new recurit Blake Ferguson and speedster Beven French.
The re-signing of Pritchard, Terepo and Gower will add depth and experience to the Eels forward pack.
2019 will be the final season for Gower and the well renowned forward will use the final season as preparation for his life after football.
Gower is completing his Certificate IV in Elite Athlete Wellbeing Management in preparation for a future role with the Eels.
Gower, Terepo, Jennings and Pritchard will return to pre-season training this Thursday 1 November.