Jose Mourinho believes Porto can beat Liverpool to progress to the semi-finals of this season's Champions League.
The former Manchester United boss guided Porto to Champions League success back in 2004, but they have not lifted the trophy since.
Last season Porto were knocked out of the European competition by Liverpool in the last-16, after the Reds thumped them 5-0 over the two legs.
Jurgen Klopp's men are favourites to beat the Portuguese club again this season but Mourinho isn't convinced things will be as easy for Liverpool this time round.
Mourinho is confident that Porto will work hard to ensure they do not suffer the same fate as last season.
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He also believes that Liverpool's attention is focused more on winning the Premier League this campaign, which could see them slip up in Europe.
"Porto have a chance to win and go through," said Mourinho at the ANTV Forum.
"Compared with last season, I think Sergio Conceicao will ask himself questions about what happened in order to do something different this time around.
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"The tie is open and what happened last year, I believe, can play for Porto in both games.
"Liverpool have absolutely fantastic individual quality, but they are disputing the league title which means that they will not rest players in the previous game or between the two games."
