John Harston sent a message to the Celtic players after watching his old club battle back to a 3-1 win over Motherwell this afternoon. The former Celtic hero was no stranger to a battle himself when as part of an all-conquering Martin O’Neill team he delivered a treble and a European final in his time at the Hoops. The 3-1 win at Fir Park keeps Celtic within touching distance of Rangers at the top of the table and as Hartson praised the team for their fightback he also delivered a stark message to the players for the rest of the season. Hartson said on social media channel X, “Good 3pts for th…