Yeah, that's him, and he's great. Considered to be potentially the most talented of all our recent midfielders whose names begin with M (and he's signed on til 2020).
He was wide right last season, but mainly because Mallan was through the middle. Received wisdom was that Magennis would move into the middle alongside McGinn this term. Probably as part of the 2 in a 4-2-3-1.