Mikel Arteta has told Raheem Sterling the time has come to make a big impact on Arsenal 's season. Struggling Sterling, on loan for the season from Chelsea , is expected to make just a fifth league start against West Ham on Saturday afternoon for an Arsenal side without four key attackers. His only goal has come in the EFL Cup and the England international has provided just a single assist. And after Mikel Merino replaced Sterling before scoring twice at Leicester last week , there is fresh