Mikel Arteta last night delivered a worrying injury update on Oleksandr Zinchenko after the Arsenal defender was brought off at halftime against Liverpool. The Ukrainian international was replaced with Jakub Kiwior at the break as the Gunners claimed a massive result in north London against the Reds with a 3-1 win. Firmly back in the title race, Arsenal are on cloud nine having secured one of their most impressive victories of the season, yet it might have come at a cost with injury to Zinchenko. Speaking to the Evening Standard, Arteta admitted that he is currently not sure how long the forme…