Nathan Ake has insisted Jack Grealish is working very hard at the moment to try and rediscover his best form at Manchester City. Ake was speaking about Grealish yesterday ahead of the Champions League last 16 clash with Copenhagen. The winger has been on the periphery at the Etihad recently. Grealish has not started any of City’s last four Premier League games, playing just 16 minutes across a couple of cameo appearances. He also missed out on playing in the FA Cup clash against Tottenham Hotspur, but did feature in the previous round against Huddersfield Town Grealish was one of City’s key pl…