Arsenal defender Jurrien Timber has suffered a serious knee injury and is expected to now be out for a lengthy period of time. The 22-year-old defender sustained the injury 50 minutes into his Premier League debut, Arsenal’s 2-1 victory over Nottingham Forest at the Emirates on Saturday. The Netherlands international, who joined the club from Ajax in a £34million transfer this summer, was substituted and helped off the pitch by club medics. Tests to diagnose the full extent of the injury and a subsequent recovery timeframe are ongoing. The news will come as a huge blow to Mikel...