Arsenal are set to extend the contract of defender Takehiro Tomiyasu, with just 18 months left on his current deal. The 25-year-old has struggled with injuries this season, and has spent the last month competing in the Asia Cup with Japan, but has now returned, and is set to be available for Sunday’s trip to face West Ham United. The defender can play anywhere across the back line, and has excelled on both flanks as well as in the centre of defence when he has played this season. Arsenal are set to confirm his contract extension in the coming days, and Mikel Arteta values him highly, and has p…