Image source, Getty Images

Off goes Jack Grealish to be replaced by Birkir Bjarnason in Villa's final change.

Will Grealish have had the last laugh in this one with everything that's happened?

Jack Grealish down on the deck with what looks like cramp.

Some home fans not happy with what they feel is time-wasting.

Darren Carter
Ex-Birmingham midfielder on BBC WM 95.6

Birmingham are starting to look like a beaten team. Villa have looked calm and assured in this second half.

Blues have lacked any real creativity and there is no one who can link the play for them.

It has been a punt upfield for Lukas Jutkiewicz and Che Adams to chase.

Into the last 10 minutes.

Villa have come close to going 2-0 ahead but Birmingham will argue they should've had a penalty for that foul on Che Adams. It's one of those that doesn't look any better with further replays.

What more is there left as a twist in this plot?

Final change for Birmingham sees Craig Gardner come on for David Davis in midfield.

Villa inches away from going 2-0 up!

Conor Hourihane rattles the crossbar with a left-foot effort from 25 yards.

Jack Grealish teed him up as well with another weaving run to the edge of the Birmingham area.

Lukas Jutkiewicz tries to drive Birmingham City forward but he can't shake off the challenge of man of the moment Jack Grealish in the middle of the park.

Terrific display this from the Villa captain.

DavidSebastianLaight: Yes Jack!!!! That’s the way to answer back!!!!

Second Birmingham substitution sees Connor Mahoney on for Jacques Maghoma.

Strong appeals from Birmingham City for a penalty but not given!

Che Adams his the deck under pressure from Kortney Hause but Tim Robinson points for a goal kick.

Seen them given.

Robbie Andrews: Birmingham City fans cheering that cowardly attack is disgraceful. Dock the club points and make them play the rest of the season behind closed doors lets see if they are so quick to cheer that. Could have quite easily have had a knife on him.

Neil Baker: Fans need to be careful, the league could start making clubs put up netting or ice hockey style screening around the stadium if these idiots carry on!!

Just over 20 minutes to play. What do Birmingham City have as a response?

Almost an instant impact from Andre Green!

Jack Grealish sneaks in down the Villa right and squares it across to the head of Green. It's goal-bound, but blocked by Wes Harding from four yards out.

Moments later, Tammy Abraham is almost on the end of a cross at the far post, but he can't hit the target.

Image source, Rex Features

The EFL has responded to this afternoon's attack on Villa's Jack Grealish by a Birmingham fan.

“The EFL condemns the mindless actions of the individual who encroached on to the pitch at St Andrew's on Sunday afternoon.

“It’s a situation no player should ever be faced with.

“In all circumstances the playing surface is for players, not supporters and those playing in the game must be able to do so safe in the knowledge they will not be subjected to this type of behaviour.

“Whilst this incident falls within the remit of the Football Association, we will work with all the relevant parties to address the issue of player and match officials' safety on the pitch and ensure the appropriate action is taken.”

Two changes for Villa now as John McGinn replaces Glenn Whelan and Albert Adomah makes way for Andre Green.

Cards being shown by both bosses as they search for an opening goal.

Booking for Villa centre-back Kortney Hause now as he tangles with Che Adams as the ball comes over the top into Villa's half.

Ged Scott
BBC Sport at St Andrew's

Birmingham City have revealed that they will not be putting out any official statement on the Jack Grealish incident until after the game, other than confirming the fan’s arrest.

But it is understood that they intend to ban the fan from the club for life.

They will also officially be apologising to Grealish after the game, for what they consider a ‘deplorable’ moment in the club’s proud history.

Reaction to the attack on Villa's Jack Grealish by a Birmingham fan continues to roll in.

Former Villa midfielder Lee Hendrie told Sky Sports that the game should have been abandoned if Grealish was injured.

"I'm all for the rivalry, I'm all for the banter, but that is literally the worst thing I've seen on a football pitch, he said.

"Jack Grealish, one of the key players - what if he breaks his jaw and has to go off the pitch? That's one key player who is out of your side. If that would have happened, I think the game would have had to have been abandoned."

Image source, Getty Images

Feel myself needing to use the old cliche "this game needs a goal".

Nothing really going for ether side so Birmingham make the first chance of the game and bring on Kerim Mrabti for Jota in midfield.