Curtis Main, Charles Dunne and Joe Shaughnessy have all left St Mirren as their contracts expired after rejecting new deals with the Paisley club.
St Mirren have confirmed the departure of the trio, who collectively have played more than 250 times for the club, as well as the exit of Richard Tait, who had already said that he would be leaving.
The news came as part of a squad update where the club revealed that Caolan Boyd-Munce had signed a one-year extension after joining on a short-term contract.
St Mirren also have an offer on the table to extend the stay of Jay Henderson, who came through the club’s youth system and been out on loan at Inverness Caledonian Thistle this season.
The end of the Premiership season also marked the end of loan spells for Dundee United’s Tony Watt and Southampton’s Thierry Small, who have returned to their parent clubs.
Main scored nine times in 39 games this season as St Mirren finished in the top six for the first time since the Premiership split was introduced. Dunne played 37 games in defence, while fellow centre-back and club captain Shaughnessy made 28 appearance.
St mirren said that “all three decided their futures lie elsewhere” but ” hank them immensely for their respective contributions to St Mirren and wish them the very best in their new challenges”.