A penalty stop and succession of top drawer saves from Dundee's Rab Douglas on his return to Celtic Park was not enough to prevent the Hoops from taking all three points.
Goals by Gary Hooper and Victor Wanyama gave Celtic a comfortable home win.
Celtic dominated the first-half almost totally with Dundee forced to defend valiantly in front of Douglas.
In the sixth minute Charlie Mulgrew's curling free-kick from 25 yards had the Dens Park number one scrambling across his goal but the ball evaded the far post.
As Celtic remained dominant, Lassad had a weak shot saved by Douglas before driving an angled-shot high over the bar after being set up Kris Commons.
The Celtic pressure, at times, was relentless.
They were awarded their penalty when Benedictus clumsily tripped Lassad in the box but while Brown's spot-kick was powerful enough, Douglas stuck up a hand to knock the ball over the bar.
It looked like the teams would go into the interval level but Hooper showed all his predatory instincts when he latched on to a Brown pass and hammered the ball past Douglas, who this time was helpless.
In the 49th minute Wanyama took an Izaguirre pass and drilled a shot from 25 yards low past Douglas and in off the post.
It became a matter of how many more Celtic would score.
Commons fired an angled-drive past the far post, Forrest drove straight at Douglas after creating space at the edge of the box, before the over-worked keeper made a great finger-tip save from Lassad's point-blank header.
Read a full report of Celtic 2-0 Dundee
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