Two men have been arrested after police released CCTV pictures of several fans wanted in connection with trouble that flared at the Manchester derby.Fans of both clubs were believed to be behind the disorder before and during the Carling Cup semi-final last week. [LNB]Two men, aged 30 and 21, were arrested on Tuesday as a result of the appeal. [LNB]Police have spoken to Manchester United and Manchester City ahead of the return leg urging the clubs to ensure their players behave during the match. [LNB]There was a public spat between City striker Carlos Tevez and his former United team-mate Gary Neville after the game at Eastlands. [LNB]Police want to ensure that the players do not incite any trouble during the second leg at Old Trafford on Wednesday. [LNB][LNB] Both the managers will be speaking to the players... Asst Ch Con Ian Hopkins Asst Ch Con Ian Hopkins said managers Sir Alex Ferguson and Roberto Mancini would be reminding their players of their responsibilities. [LNB]"We have met with the clubs - the FA had a representative there as well - who spelt out very clearly to the clubs what action would be taken if there is any player involvement in anything that goes wrong with the crowd. [LNB]"Both the managers will be speaking to the players; I understand the referee will speak to the captains before the game about that as well. [LNB]"So they're doing everything that they can to make sure it's a passionate and memorable derby." [LNB][LNB] [LNB][LNB]Assistant Chief Constable Ian Hopkins said he wanted to make sure players did not influence the crowd[LNB]Greater Manchester Police released the CCTV images of men they wanted to trace on Tuesday morning. [LNB]Officers said "a small number of so-called football fans" marred the otherwise enjoyable game. [LNB]Coins and seats were thrown by some supporters during the match, while police were also pelted with bottles. [LNB]"The people who caused the disorder are a disgrace to the vast majority of peaceful and genuine fans who simply wanted to enjoy the match," said Supt Craig Thompson. [LNB]"If you recognise the people pictured, please get in touch, we need to find those responsible so we can stop them from ruining matches for anyone else." [LNB]United trail City 2-1 ahead of the return leg.