Sportsound's build-up to this afternoon's semi-final is about to begin on BBC Radio Scotland.

Former Rangers winger Neil McCann, ex-Celtic goalkeeper Pat Bonner, former Scotland centre-half Willie Miller and BBC journalist Tom English provide the analysis alongside host Richard Gordon.

Liam McLeod is your commentator from Hampden.

Click the wee link at the top of this page to listen.

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Rangers will have perhaps seen a flaw in the Celtic armour as their city rivals were held to a 1-1 league draw at home to Motherwell last Saturday. A result that ended a 17-game winning run.

However, they stumbled themselves the following day - 2-0 away to Aberdeen - their second defeat in three games after their 3-2 loss at Celtic Park.

Rangers have won three of their last 10 meetings with Celtic, but none of those have come in the five since their last win - at this stage of the cup a year ago.

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Celtic players come out for their pre-match warm-up.

It's cold and drizzly at Hampden. No wonder a few of the foreign bhoys are reaching for extra layers of clothing!

Brian Laudrup
Former Rangers midfielder on Viaplay

Rangers' gameplan at Celtic Park was much better.

The way they pressed high, cut the supply to Callum McGregor. And, without possession, Rangers were really good. But they need to get their creative players - Raskin and Cantwell - on the ball and do the business.

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If you have a few moments before kick-off, you should read Tom English's article outlining the statistics that have stacked up against Rangers in recent games against their city rivals.

And he concludes that this semi-final is more significant for the Ibrox side and manager Michael Beale than it is for Celtic.

Click this link to read.

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Here's how Caley Thistle, led by former Rangers striker Billy Dodds, eased into the cup final yesterday.

The Championship promotion chasers were clinical in beating League 1 play-off qualifiers Falkirk 3-0 at Hampden.

Click below to watch the two goals from veteran striker Billy Mckay and the other from man of the match Daniel Mackay.

Martin O'Neill
Former Celtic manager on Viaplay

Playing Reo Hatate is a risk, but it is a risk worth taking.

Chris Sutton
Former Celtic striker on Viaplay

Reo Hatate is dynamic in the midfield. Celtic are a better side with Hatate in it.

Image source, BBC Sport

Rangers: McGregor, Tavernier, Goldson, Davies, Barisic, Lundstram, Raskin, Tillman, Cantwell, Kent, Morelos.

Substitutes: McLaughlin, Yilmaz, Hagi, Souttar, Matondo, Kamara, Wright, Sakala, Arfield.

Celtic: Hart, Johnston, Carter-Vickers, Starfelt, Taylor, McGregor, Hatate, O'Riley, Jota, Maeda, Kyogo.

Substitutes: Bain, Haksabanovic, Mooy, Turnbull, Kobayashi, Oh, Iwata, Ralston, Vata.

Image source, BBC Sport

Celtic also welcome back two key men as Reo Hatate returns to midfield, while Jota is back on the wing after both recovered sufficiently from injury.

Tomoki Iwata and Sead Haksabanovic are the two who make way from the line-up that started last Saturday's draw with Motherwell.

Liel Abada does not make it, however, while fellow winger James Forrest also remains sidelined.

The big team news for Rangers is that both centre-back Connor Goldson and winger Ryan Kent return to the starting XI.

Goldson, who comes back into the side after missing a month of action, replaces John Souttar following last Sunday's defeat at Aberdeen.

Meanwhile, Kent is in for Fashion Sakala after sitting out the last two fixtures with injury.

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Let's get straight to the all-important team news...

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Second-tier Inverness Caledonian Thistle are already safely there, but most expect the winners of today's second Scottish Cup semi-final to go on to lift the trophy.

It's holders Rangers against a Celtic side on their way to successive Premiership titles under Ange Postecoglou.

Another big-occasion Old Firm derby with so much at stake.

Stay with us for the build-up, live commentary and post-match reaction on BBC Radio Scotland and online.

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