Arsenal defender Jakub Kiwior worked his way into the starting XI for a productive spell in recent months, but his future is far from certain. The 24-year-old joined from Serie A side Spezia 18 months ago, but it took some time for him to earn regular game time under Mikel Arteta. Kiwior came in for a run of games at left-back in February where he impressed at times, but eventually lost his spot after a disastrous performance against Bayern Munich in the Champions League. The Poland International has been linked with a move back to Serie A, with AC Milan among the clubs interested in his signa…