Citing an unnamed source “close to the situation," the Times Union in Albany, N.Y., reported Christian agreed to a contract with the upstate New York school Tuesday.
Patsos was forced to resign last month after a report surfaced that he allegedly mistreated a student manager who lives with obsessive-compulsive disorder.
It was also reported that members of Patsos’ staff withheld players’ per diem payments for meals in order to pay a large bar tab. Patsos denied all the allegations at a news conference.
The charges followed an 8-24 season for the Saints, the worst under Patsos in his five seasons with the school. According to reports, Patsos had at least two years left on his contract.
Patsos came to Siena from Loyola Maryland, where he took over a program that finished 1-27 the year before he arrived and led the team to the NCAA tournament in 2011-12.
Christian, 36, is considered one of the rising coaches in Division I.
In 2013-14, he led the fourth-place Mountaineers to the Northeast Conference tournament championship and the NCAA tournament, where they lost in the First Four in Dayton, Ohio, to Albany.
In 2016-17, Mount Saint Mary’s won both the NEC regular season and tournament titles. The Mountaineers won their First Four game over New Orleans before losing to Villanova in the Round of 64.
Despite having five players transfer off that team, including guards Elijah Long (John Carroll) and Miles Wilson (Mount Saint Joseph), Mount Saint Mary's tied for second in the NEC and finished with an 18-14 overall record this past season.
Christian, who came to Mount St. Mary’s after serving as an assistant under Shaka Smart at Virginia Commonwealth, was 101-95 in six seasons with the Mountaineers, including an impressive 67-39 in the NEC.