Arsenal face a tough run-in towards a potential Premier League title starting with a trip to Manchester City, and there are some players who they cannot afford to lose. The likes of Bukayo Saka and Declan Rice will be monitored carefully, as a bad injury to either player could be detrimental to Arsenal’s hopes of glory, both domestically and in the Champions League. However, despite the quality and consistency of both players, there is arguably an even more important player that Mikel Arteta cannot be without at any stage during the run-in. He found this out the hard way last season, as an inj…