"I'm committed to Chelsea".
His current contract at Chelsea will expire in the year 2019, and there have been speculations that he could be on his way to Real Madrid next season.
Reigning league champions Chelsea are fighting to salvage their season, having slipped to fifth in the league table, four points behind Liverpool in fourth and the last of the Uefa Champions League places. I have a contract until next year and I will be here.
Chelsea forward Eden Hazard wants to leave the club this summer, after exiting the Champions League this week.
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Ligue 1 giants Paris Saint-Germain and European champions Real Madrid have both been linked with moves for Courtois, but the goalkeeper has said he is not focusing on his future, only on helping Chelsea finish the season as strong as possible.
Speaking after the match, Alonso told BTSport: "They have Lionel Messi and I think they were the better team even though we competed well in both games".
"It's annoying but I have to come out, say I made a mistake, I made some good saves as well, and it's unlucky to go out to goals from mistakes. All I can say is I'm committed to Chelsea and also committed for next year".
After his goal in the 1-1 first-leg draw at Stamford Bridge, the Argentine put the ball through the legs of Thibaut Courtois to open the scoring early on in Camp Nou before setting up Ousmane Dembele after an impressive run.
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He said Russian Federation remained open for "friendly" relations with any country prepared to cooperate with Moscow. Britain has expelled 23 Russian diplomats and suspended high-level contacts with Moscow over the incident.
"We knew they have top players and we cannot give them one metre because they can create and score".
Chelsea won the Premier League in Conte's first season in charge, but this has been an at times tumultuous campaign.
"We deserved more, but against this team you can not concede and then miss chances", Alonso added.
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London has blamed Moscow and on Friday, even directly implicated Putin in the attack, prompting the Kremlin's fury. Russia's response has also targeted the British Council, which promotes cultural ties.