Queen of the South parted company with manager Gary Naysmith in the wake of Saturday's 3-0 home defeat to Partick Thistle.
The result continued a poor run of form for the Doonhamers, who now face the play-offs as they bid to stay in the Ladbrokes Championship.
Earlier on Saturday, Jonatan Johansson and No 2 Peter Houston left Morton before their final match of the season, a 1-0 win over Dundee United at Cappielow.