Edgaras Jankauskas and Steven Pressley gave Hearts
a two-goal lead but Stephen Pearson hauled Celtic back into the game, before McManus grabbed a late double to snatch all three points.
And he added: "We gave Hearts
a run for their money when we met in the same tournament three years ago.
Then after 70 minutes McCann gave Hearts
the lead when he rounded Magnus Hedman after running onto Hamilton's pass.
Gary Oliver and Kevin McHattie gave Gary Oliver and Kevin McHattie gave Hearts
a 2-1 win at Stenhousemuir.
Elsewhere, Stephen Elliott's double gave Hearts
a 2-0 win over bottom-place Hamilton which just about kept them in the hunt.
The teenager was out-muscled for the penalty-that-never-was and then out-thought for the equaliser that gave Hearts
a share of the points last Sunday.
A deep corner from Claus Jensen was met at the far post by Knight whose header gave Hearts
keeper Craig Gordon no chance.
Steve McReady gave Hearts
a 55th minute lead and Alex Winiski made it two with 20 minutes remaining.
The hoodoo looked set to continue when Jose Goncalves gave Hearts
the lead before Steven Thomson restored parity and then Dargo claimed Saints' win with a superb volley.
But the 56-year-old, who gave Hearts
their first major trophy for 36 years when winning the Scottish Cup in 1998, insisted he was staying.
Player of the week was Colin Cameron whose two goals gave Hearts
a vital win over Dundee United.
The sheer pace of Winters, Olofsson and McLaren gave Hearts
a real handful.