Rob Kelly replaced Craig Levein 14 months ago and was successful in steering the crisis stricken club away from the drop zone. However, a recent poor run of form, including a dismal 3-0 defeat to Plymouth Argyle has lead to Mandarics decision to take action.
It has been suggested that Worthington has been given the position until the end of the season when Mandaric will assess the clubs situation.
More news is yet to follow.