Celtic have made a double change at half-time.

It seems like Neil Lennon has agreed with those criticisms of his 3-5-2 formation and is going with a back four.

Ryan Christie and Mohamed Elyounoussi have come into midfield, with striker Leigh Griffiths and centre-half Stephen Welsh withdrawn.

Celtic get the second half under way. It's a long way back now for Neil Lennon's side.

Pat Bonner
Former Celtic goalkeeper on BBC Sportsound

Lille are ahead in the other game in Celtic's group thanks to a goal on the stroke of half-time from Yusuf Yazici.

The French side are surely in control with their Czech hosts down to 10 men after Ladislav Krejci red card after 23 minutes.

Michael Stewart
Former Scotland midfielder on BBC Sportsound

On-loan Brighton & Hove Albion centre-back Shane Duffy is getting a real roasting on Twitter.

The Republic of Ireland international came with a big reputation, but the three-man central defence adopted recently by manager Neil Lennon is creaking for a second game running.

Kheredine Idessane
BBC Sport Scotland at Celtic Park

Celtic can have no complaints at all about the half-time score. There will be concern in the home dressing-room at how easily they’re conceding goals these past two games.

AC Milan have been as clinical as Rangers were at the weekend. Celtic need the next goal and need to find a way to stop Milan getting a third.

The talk before kick-off was all about evergreen Zlatan Ibrahimovic.

However, while the 39-year-old striker has been quiet, it has allowed his understudies to shine.

A header from Rune Krunic and a second just before the break from Brahim Diaz has the Serie A leaders cruising at the break.

Image source, SNS

Pat Bonner
Former Celtic goalkeeper on BBC Sportsound

Too easy for Milan.

Theo Hernandez has been lively down the Milan left and the full-back finds Brahim Diaz lurking on the edge of the penalty box.

The midfielder on loan from Real Madrid holds off a couple of challenges and drives low past goalkeeper Vasilas Barkas.

Image source, BBC Sport

Pat Bonner
Former Celtic goalkeeper on BBC Sportsound

Kheredine Idessane
BBC Sport Scotland at Celtic Park

Celtic aren’t lacking in height at the back, but they don’t half look susceptible to crosses, either from open play or set pieces. The home side, while much improved from the weekend, have still given the ball away too often for comfort and can’t afford to concede again, surely.

Albian Ajeti is struggling to recover from a naughty bit of play from Franck Kessie, the Ivory Coast midfielder running his studs down the Celtic striker's ankle from behind unnoticed by the officials.

Pat Bonner
Former Celtic goalkeeper on BBC Sportsound

The ball is bobbling about the Celtic penalty box as Milan start to exert some more pressure.

Nervous moments at the back as Shane Duffy allows a long throw to bounce over him in the six-yard box, but the home side survive.

Talking of Zlatan Ibrahimovic, much of the talk before kick-off was how Celtic's defence would handle the in-form veteran.

However, it was midfielder Rade Krunic who towered above Stephen Welsh, the 20-year-old making only his third Celtic appearance, to score.

Image source, SNs

Celtic are back applying the pressure and that man Zlatan Ibrahimovic is not only dangerous in the opposing penalty box but also an asset in his own as he rises to head clear a dangerous free-kick.

Pat Bonner
Former Celtic goalkeeper on BBC Sportsound

That's Milan's first venture into the Celtic penalty box and they score.

Samu Castillejo fires an inswinging cross into the six-yard box and Bosnia-Herzegovina striker Rade Krunic rises at the back post to head home.

Image source, BBC Sport

Albian Ajeti has also impressed early on for Celtic and, when he intercepts a wayward Milan pass, he finds Leigh Griffiths behind the visiting defence, but his strike partner strays just offside.