Luis Garcia alerted Liverpool to the threat Barcelona has, as both teams will lead the semi-finals of the Champions League.
The former Reds midfielder, who won the 2005 trophy – scored five goals in that year, outlined the quality of the Catalan giants as something to match their wishes and their talisman, Lionel Messi.
Garcia moved from Barcelona to Merseyside in 2004 and spent three seasons at Anfield where he attended 121 club performances during the year, also winning the FA Cup, Community Shield and UEFA Super Cup along with his Champions League honor.
"Barcelona is one of the football teams," Garcia ECHO said.
"At the beginning of the season they would go to the Champions League trophy.
"They are a club that wants to win this trophy – especially now that it has gone to the trophy in recent seasons."
"It's a team that has to win trophies on the international scene and it's a very strong team that will be a great success this year."
"Of course Liverpool should also be worried about Messi."
La Liga heavyweights did not make it to the finals of the premier European competition, as it beat Juventus 3-1 in the 2014/15 campaign.
In the semifinals of this year's event, they find themselves on the incredible side of Liverpool, which is in charge of Virgil van Dijk, Mohamed Salah, Alisson Becker, Sadio Mane and Andy Robertson.
And Garcia believes that none of the teams is a real favorite, because both sides face a really tough job coming close to each other when they play at Camp Nou on Tuesday.
"At the end, it's the Champions League semifinal," he added.
“Every team is so strong and it will be difficult for someone.
"If Liverpool or Barcelona get to the next round, they're guaranteed to face a tough team, and both teams could beat everyone on that day.
"It will be a really big challenge and it's hard to predict who will win this game."
Luis Garcia spoke as part of the GambleAware campaign called Bet Regret, which aims to prevent people from gambling impulsively and increase their confidence in their gambling behavior.