Former Barcelona star David Villa feels his old club can be beaten as they prepare to face Atletico Madrid in the Spanish Super Cup.
Spain's record goalscorer is confident his side can cause the reigning La Liga champions plenty of problems when the teams meet in the first leg on Wednesday, and believes his former employers are weak when they do not have the ball.
"Atletico will have many chances to win, but for that to happen we have to do everything perfect," Villa told reporters.
"We can't make mistakes, play well at the back, try to keep the ball as long as possible - because we know that Barca suffer when they lose the ball - and then we can take our opportunities in attack.
"If you have to look for a favourite, it is Barcelona. We have to fight against that. When the match starts, we all have the same chance to win.
"Just look at the statistics of recent years and the way they have started the league. We must seek our options and how we can hurt them. Lifting this title is very important to us."
Villa spent three seasons at the Nou Camp following his transfer from Valencia in 2010, and has World Cup, European Championship, and Champions League winners medals to his name after an illustrious spell in recent years.
The 31-year-old made the switch to the Vicente Calderon after leaving Barcelona for a fee of £4.5 million, as Madrid set out to replace last season's star man Radamel Falcao.
And despite big respect for his Barcelona teammates and the club as a whole, Villa revealed this will not stop him celebrating if he scores during the tie.
"I have many friends and fond memories of my three years there, but when we start the game, they are my rivals.
"Hopefully I can help my team. I have always celebrated my goals. Out of respect, however, the exuberance of the celebration is different if you face an opponent that you love."
Barcelona enjoyed a blistering start to their La Liga campaign after they crushed Levante 7-0 in their opening fixture. Atletico meanwhile, also enjoyed an impressive victory as they picked up a 3-1 away win over Sevilla.