The new boss believes young players like Jack Grealish must show their worth first before being guaranteed a spot in his team. Garde takes charge for the first time on Sunday when rock bottom Villa host the Barclays Premier League leaders Manchester City. Press Association Grealish, 20, was given a prominent role under former boss Tim Sherwood but has struggled for form this season and Garde insisted the midfielder and others must knuckle down. Garde said: “Jack is among the young players. He will have an important role for Villa. There is quality in other players as well but what is important in football are two things. “The first one is talent, if you’re not talented you have no chance, but talent without hard work is nothing. “In modern football young players seem to be very impatient. Sometimes this is not their fault. This is the fault of the people around them because they play, one, two or 10 games and suddenly they are not good enough to play and everything collapses.” Garde has Micah Richards available after suspension to face his former club while Idrissa Gana could return after being rested. Villa have lost their last seven games and Garde replaced the sacked Sherwood this week in his first role since leaving Lyon in 2014. City are unbeaten in their last eight outings in all competitions but Garde believes Villa can upset the odds and shock the leaders. “Sometimes when you believe what you can do maybe things can turn on your side,” he said. “It’s a tough game to start but they are top of the league and we are bottom. They are unbeaten for eight games and played very well in Sevilla. “I would say we have nothing to lose but we are not going into the game saying we have already lost.” Remi Garde has told Aston Villa’s stars to prove they are up to their relegation fight.