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SAMIR NASRI was involved in a tunnel bust-up on his return to the Emirates. Manchester City's former Arsenal star clashed with Gunners midfielder Emmanuel Frimpong after the final whistle. There has been bad blood between the pair since Frimpong reacted to Nasri's �24million switch to City in August by tweeting: "Money is the root of all evil." And the pair squared up to each other after Sergio Aguero's 83rd-minute winner booked City's place in the last four of the Carling Cup. A Gunners spokesman said: "Words were exchanged � and that was that. "No punches were thrown but there was a lot of noise. Samir was speaking in French but they did not touch. It was handbags." Nasri received a hot reception from baying Arsenal fans who booed his every touch. City boss Roberto Mancini revealed: "I played him to spare him a hostile reception when we play here in the Premier League. "I think Nasri can play better than he did tonight � he's a top player. But this was the first time he came back to Arsenal and maybe he was nervous. "It was not easy for him coming back here." Aguero's late winner gave City their first win at Arsenal for 36 years and keeps the Premier League leaders and FA Cup holders on course for a domestic Treble. Mancini said: "The season starts now. December and January will be crucial months because we have some big games. After that we will see where we are." Gunners boss Arsene Wenger said: "I felt we were a bit naive with the goal. We made it easy for them to score. "I disagree with the Arsenal fans' reaction to Nasri. I want the players who play with us respected. "There are no hard feelings, I'm sure the fans love him and wanted him to be here." The semi-final draw will be held after tonight's tie between Manchester United and Crystal Palace.