Image source, SNS Group

It's been all Celtic in this Scottish Cup quarter-final replay and the home side lead thanks to Jason Denayer's 17th-minute header.

Jason Denayer is in the mood for another goal as he surges forward from defence. The ball breaks to Kris Commons and the playmaker's dinked effort is gathered by Radoslaw Cierzniak.

Nir Bitton is suddenly one-on-one with Radoslaw Cierzniak but the Celtic midfielder is not often in these situations and makes a horrible mess of it, losing out to covering defender Callum Morris.

Celtic defender Efe Ambrose is cautioned for a clumsy late challenge. Half-time will be upon us soon.

Dundee United full-back Ryan McGowan powers forward to fire in a good cross and home keeper Craig Gordon gets a vital touch, with Nadir Ciftci in close proximity. The United striker ends up in the net feeling sorry for himself and is therefore not alert to the loose ball.

Celtic winger James Forrest has the beating of John Rankin every time and his latest run and cross has Radoslaw Cierzniak flapping to palm the ball against the crossbar.

BBC Scotland's Tom English at Celtic Park

"Celtic's possessions stats would be off the scale, but they wouldn't want to leave themselves open to a sucker punch. United don't look capable of it at the moment, but this tie is still not over despite Celtic's ownership of the ball. Nadir Ciftci's effort, though easily saved by Craig Gordon, might serve as a reminder to the home team that they're not in the clear just yet."

Dundee United finally have a shot on target as Nadir Ciftci goes for a very ambitious drive from fully 35 yards out. Easy save for Craig Gordon.

Yet another Celtic corner as James Forrest takes aim at goal and his shot is deflected wide by stand-in left-back John Rankin on the slide. Virgil van Dijk gets his head on the delivery but can't keep it down.

United survive another couple of Celtic corners but the visitors have not been able to retain any kind of possession so far.

Celtic striker Leigh Griffiths has another crack at goal and this one draws a few oohs and aaahs from the crowd as it whistle over from 25 yards.

BBC Sportound pundit Murdo MacLeod

"The Dundee United heads are down, it just looks like they are accepting what is happening to them."

BBC Radio Scotland's match commentator Rob Maclean

"Whenever Celtic lose the ball, they work so quickly to get it back."

BBC Scotland's Tom English at Celtic Park

"Anthony Stokes doesn't score many goals these days but that was a precise free-kick right on to Jason Denayer's head for the opener. United defending awful, though. Denayer unmarked and barely had to jump. Routine stuff. United haven't turned up yet. Celtic extremely comfortable."

Celtic winger James Forrest has a dig from long range and it takes an awkward bounce in front of goal but Radoslaw Czerniak is right behind it. Leigh Griffiths is next to have a pop and his effort is well wide.

Image source, SNS Group

Anthony Stokes curls in a juicy delivery from a free-kick and Celtic defender Jason Denayer has a free run to flick a looping header over Radoslaw Czerniak.

Celtic striker Leigh Griffiths produces an acrobatic flick to get on the end of a driven cross from Anthony Stokes but can only divert the ball straight into the arms of Radoslaw Czerniak.

Better from the visitors now as Nadir Ciftci draws a foul from Efe Ambrose but Paul Paton's over-hit free-kick has Calum Butcher at full-stretch to get his head on it and Craig Gordon gathers comfortably.

United full-back Ryan McGowan shows great strength and determination to get forward and drill in a cross but Celtic keeper Craig Gordon is alive to the danger.

BBC Scotland's Tom English at Celtic Park

"Jackie McNamara's heart would have skipped a beat when Radoslaw Czerniak clattered into Leigh Griffiths in the opening minute. Red has so often been the colour in this this fixture in recent weeks. Yellow this time. Celtic dominant. Kris Commons has 11 goals this season and looks determined to get number 12 tonight."