The deal will see the club work with SiS and its team of sports nutrition experts to create bespoke nutrition plans for each player across Liverpool’s first team.
SiS will also work alongside the academy and ladies sides - and will include a wide range of SiS products, from its SiS GO Isotonic Energy Gels to the SiS Protein range.
Each plan will be specifically designed to benefit each player’s performance by looking specifically at nutritional considerations for training, matchday and recovery.
Billy Hogan, chief commercial officer at Liverpool FC, said: “Nutrition is integral to any successful football team and we’re looking forward to working alongside SiS this season.
“SiS is committed to taking its position in the sports nutrition industry seriously which is something that is extremely important to Liverpool Football Club.”
Ashley Read, marketing director for SiS, added: “We’re excited about expanding into this partnership with Liverpool FC.
“The club shares our awareness and focus on the importance of marginal gains and we look forward to supporting them with innovative sports nutrition solutions to meet their needs.
“Working with the LFC team, we’ll develop and test a number of innovative products we have in our launch pipeline and have their feedback and insights support our product development for 2017.”
The deal is a huge coup for SiS which is also the official sports nutrition supplier to Team Sky, Team Wiggins, USA Cycling, Katarina Johnson-Thompson, GB Rowing and Spartan Race.
SiS was founded in 1992 and manufactures all of its products in Nelson, Lancashire.