The Reds have a chance to win their sixth European Cup by beating the Spanish holders at the NSC Olimpiyskiy Stadium in Kiev.
Werner, though, promised fans that manager Jurgen Klopp will be backed in the transfer market, as Liverpool seek to close the gap on Premier League champions City and runners-up Manchester United.
"Whatever happens on Saturday night, we will ensure we have a strong squad to compete for trophies next season which will have even more depth.
"We will make decisions that will improve the team and we will sign players who make us even more successful."
While Suarez and Coutinho both walked away from Anfield in favour of a switch to Camp Nou, Werner claimed the desire of Virgil van Dijk to sign for Liverpool indicates the allure of working with Klopp.
"With Virgil, it was very clear that he wanted to come to play for Liverpool," he said.
"We always read about how players have a dream to play for one of the great Spanish clubs. Under Jurgen's leadership, top players want to come to Liverpool.
"I am very positive about our future because Jurgen attracts the best players."