Dani Alves has issued a warning ahead of Tuesday's Copa del Rey tie against Athletic Bilbao by insisting Barcelona have room for improvement.
Also, in winning their last 10 successive matches, Pep Guardiola's side have scored 42 goals and conceded just four - including a run of 667 minutes where their goal remained unbreached, a run that came to an end in Saturday's 5-1 derby mauling of Espanyol.
The worrying thing for opponents is that, in Alves' opinion, Barca can still get better.
"This team has no ceiling to its improvement. We've been showing on the pitch how we've got better. We found it hard to finish games off at the start of the season. Now we are on a great run, although we have to keep our feet on the ground," said the Brazil international.
Tomorrow's encounter at the Nou Camp pits the two most successful sides in Copa del Rey history against each other - Barca having 25 crowns to Athletic's 23 - and is a repeat of the 2009 final which the Catalan side won 4-1.
That triumph was one of a record-breaking six trophies Barca won in that year and, although there is a long way to go yet, Alves is not ruling out a repeat in 2010/11.
He added: "There's no harm in dreaming and with this team anything is possible. We are on the right track to being able to compete and nothing is going to distract us. With Barca, nothing is impossible."
Barca's cause against Athletic has been helped by the injured-enforced absence of the Basque side's star striker Fernando Llorente, although Alves insists their opponents are no one-man team.
"He's an important and vital player for them, but Bilbao are much more than just him," said the former Sevilla player.
"It's a tough tie. There are two games and everything won't end on Tuesday, there's still a second game to come and we are just looking to play well."
Aside from that tie, there are two other first leg matches taking place tomorrow night, with the local derby between Valencia and Villarreal catching the eye while Segunda Division Cordoba - one of only two remaining non-top flight club left along with Real Betis - host Deportivo La Coruna.
The remaining five matches take place on Wednesday, with Real Madrid looking to the end the year on a high note against Levante.
Madrid, who won the last of their 17 cup crowns in 1993, were pushed to the limit in the Sevilla game after playing almost half-an-hour with a man less following Ricardo Carvalho's dismissal but they made it 15 successive wins at the Bernabeu thanks to Angel Di Maria's 77th-minute winner.
Mourinho was delighted with his side's performance, and admitted he wished it was their final outing of 2010.
"It's a shame we have to play on Wednesday because my men deserve a holiday after the hard work they've done these past few months," said the Portuguese.
That result at the Bernabeu left struggling Sevilla - the Copa del Rey holders - with six defeats and a draw in their last seven games and Gregorio Manzano's men will be desperate to end that when they play host to Andalusian rivals Malaga on Wednesday.
Also in action on the same night are last season's runners-up Atletico, who face an Espanyol side who saw their perfect home record shattered by neighbours Barca at the weekend, while Real Mallorca host Almeria and in-form Getafe go to second division leaders Betis.
The second legs take place in the first week of January.
