Bayern Munich boss Niko Kovac has issued Thomas Muller and Jerome Boateng a warning ahead of Saturday’s Bundesliga game at 1. FSV Mainz 05The 2014 World Cup winners were benched in Bayern’s last two matches, which has seen them end a four-game winless run with victories over VfL Wolfsburg and AEK Athens.Only Muller has featured in Bayern’s two fixtures, in a 15-minute cameo for Tuesday’s Champions League win in Greece, while Boateng is yet to make an appearance since October 2 in the club’s 1-1 draw with Ajax.And now, following their recent upturn in results, Kovac warned the experienced duo that they have a fight on their hands to insert themselves back into his starting line-up.“After the international break, we decided on a line-up that played the last two games. We did a good job and won both games,” said Kovac in a press conference on YouTube.“We are happy, even those that didn’t play. That’s just what’s happening at the moment. That doesn’t mean Thomas won’t play the next games.Merson believes Arsenal should sign Sancho Manuel R. Medina – September 14, 2019 Borussia Dortmund winger Jadon Sancho might be the perfect player to play for the Gunners, according to former England international Paul Merson.“We have to make decisions going into every game. He’s still nice and friendly and training well. It’s all good.”“In our first games [this season] I did switch around in central defence. Now, in the last two games, I just chose the same line-up and they did a very good job.“Jerome is training very well. I can’t announce now that I’m going to change everything tomorrow.“I’m going to look at training. If I have the feeling that someone is exhausted then I will react. If we have the feeling that everyone is super fit and healthy then we won’t change the line-up.”Bayern are fourth in the Bundesliga and will take on Mainz at the Opel Arena this weekend with kick-off to begin at 15:30 (CEST).