Former West Ham striker Sebastien Haller replaces Niclas Fullkrug for Dortmund.

It's Haller's first appearance since he scored the winning goal for the Ivory Coast in the Africa Cup of Nations final on 11 February.

Noussair Mazraoui is the latest player to be introduced for Bayern Munich with Konrad Laimer going off.

Joshua Kimmich delivers a teasing cross to the far post but Bayern don't have anyone there to attack it.

This is so finely balanced with 20 minutes left to play.

Still it's Bayern controlling possession but the chances aren't coming freely.

Konrad Laimer loses it on the edge of the box and it's a Dortmund goal kick.

Dortmund turn to their bench with Marco Reus and Salih Ozcan on for Julian Brandt and Felix Nmecha.

Mats Hummels once again.

Substitutes Serge Gnabry and Kingsley Coman combine with the later squaring the ball in the direction of the unmarked Harry Kane on the edge of the six yard box.

It looks set to be a simple tap in for Kane until Hummels slides in and clears away.

Another miss for Harry Kane.

It's just not his night.

This time it's a corner that is glanced on at the near post by Matthijs de Ligt and Kane gets it horribly wrong at the back stick. He did have a team-mate just a yard in front and might have seen the ball late.

Counter-attack seems to be the preferred option now for Dortmund and they have the pace to play that way.

Burnley loanee Ian Maatsen picks it up on the edge of his own box and sprints the length of the field.

It's a tired shot that curls a few yards wide.

Dortmund seem to have dropped a little deeper, it was inevitable that would happen at some stage as they look to hold on to their lead.

Bayern are struggling to break them down as it's worked from side to side.

Thomas Tuchel feels now is the time to throw caution to the wind.

Three attacking changes incoming.

Kingsley Coman, Serge Gnabry and Mathys Tel are on with Thomas Muller, Leroy Sane and Jamal Musiala going off.

Thomas Muller meets a cross but scuffs his volley into the ground.

An hour gone and Dortmund are still good for their advantage.

In fact they have out-shot Bayern in this second half.

Thomas Tuchel has seen enough. There's some movement on the touchline and substitutions are imminent.

Mats Hummels is a strong candidate for man of the match.

He's been a rock at the back and now he's having a pop at goal.

Hummels picks it up just outside Bayern's box and is urged to shoot by the small number of travelling Dortmund fans. It's hit with power but straight at Sven Ulreich and easily saved.

Jadon Sancho with some lovely close control work. He makes ground down the right and weaves through defenders before his low cross is turned away for a corner.

Bayern deal with the set-piece via the head of Matthijs de Ligt and it's cleared up to the halfway line.

Dortmund go route one to find Karim Adeyemi who makes a bit of a mess of controlling the high ball.

Momentum lost after he made a good run in behind the Bayern defence and his square ball is intercepted.

How have Dortmund not doubled their lead?

Some great one touch football sees the ball fall at the feet of Felix Nmecha. The midfielder shapes his body nicely and hits a first-time shot but Sven Ulreich pulls off a fantastic save.

Karim Adeyemi drives into the box and pulls the trigger but his shot is blocked back on to him and behind for a goal kick.

Five minutes gone in the second half and Eric Dier passes the ball straight out for a throw-in.

He didn't seem to be under any pressure but maybe caught in two minds as he approached the halfway line.

Harry Kane squares the ball for Alphonso Davies and the Bayern left-back makes a meal of the shot with his weaker right.

It bobbles behind for a goal kick.

What is Dortmund's gameplan for this second half?

Sit back and protect a lead? That could prove very dangerous with the attacking options Bayern boast.

This first 10 or 15 minutes is going to be key.