Kellacher started his managerial career whilst he was still playing for
Nairn County, managing
Inverness Caledonian Thistle's Under 20s side, from 2006 to 2009, when he was briefly made redundant when Inverness were
relegated from the Premier League, before rejoining the role following their promotion in 2010, and remaining with the club until he was promoted to the role of assistant manager in 2018, where he served beside
John Robertson,
Neil McCann,
Billy Dodds, and
Duncan Ferguson. In October 2024, following Inverness going into
administration and the sacking of
Duncan Ferguson, Kellacher was given the role as head coach, with club record goalscorer, captain, and reserves coach,
Billy Mckay being given the assistant manager role. His first game in charge, coming less than 3 days after his appointment, was a 3–1 away loss to
Dumbarton. On 9 November 2024, Kellacher secured his first win as Inverness boss, with a 2–1 win away to
Cove Rangers, bringing Inverness back into positive points following their 15-point deduction for entering administration. After taking 7 points out of possible 9 against
Kelty Hearts, Cove and
Alloa Athletic in November, Kellacher won the League One manager of the month award. After winning four of their opening five league games the following season and climbing up to 4th in the table despite a five point deduction, Kellacher won the League One manager of the month award for August. In October, Kellacher followed this up with September's League One manager of the month award, with a 100% record for the month, and having conceded only 3 goals across all competitions. After missing out on October's award to
Stenhousemuir's
Gary Naysmith, Kellacher picked up Manager of the Month award for November, his third title of the season, having gone unbeaten winning 10 of a possible 12 points.
Managerial record ==References==