BBC Sport's David Ornstein at Estadio Beira-Rio

"How much could these missed changes come back to haunt Algeria? After a nervous start, the Desert Foxes have rattled the Germans with an intense pressing game that is exposing their opponent's shaky back line.

"We've just seen a missed pass from Mario Gotze that caused coach Joachim Low to jump off his seat in the dugout and berate his players. That was most out of character - he seems very agitated, while normally-volatile opposite number Vahid Halilhodzic looks as cool as the temperatures inside this arena. The Germany fans have fallen silent, too."

Thomas Muller has not seen or heard the ball since the opening 10 minutes but now he gets on the end of a decent cross from the left, heading over the top.

On the bench, 70-goal man Miroslav Klose looks nervous. But then Germany put together a crafted move as Muller picks out Mesut Ozil on the left, he doesn't know whether to shoot or cross and does neither really. Slick.

Mac Jerry:, external Germany looking really vulnerable. The back four doesn't look convincing enough. The Desert Foxes can cause a shock.

Brit in Bethesda:, external The high line, Philipp Lahm playing centre midfield, Sami Khedira benched, four centre backs. Joachim Low is playing World Cup Russian roulette.

Stephen Rasp:, external It's always the same with Germany. They play underwhelming football, but still end up winning.

Germany are ragged. Benedikt Howedes plays a slack pass out of play and Joachim Low is out of the dugout to give him what for.

If you let this German side play, you've had it. So Algeria are just not allowing them to. Great stuff from the underdogs thus far.

Former England winger Chris Waddle
BBC Radio 5 live in Porto Alegre

"When you get chances against a quality side like Germany you've got to take advantage, because Germany will at some stage have a period of play where they will cause problems.

"So far it is all Algeria. Their game plan has been spot on. They are breaking in numbers and breaking at pace.

"Germany have got to break the play up higher up the field and then break forward. For me they are playing too slow."

Remember you can listen to Chris' analysis without leaving this page - click the 'Live Coverage' tab at the top of this page for BBC Radio 5 live commentary.

What a chance again! Algeria are absolutely flying as Faouzi Ghoulam gets away down the left, Mezut Ozil can't or won't track him back into the box and his left-footed strike fizzes just past the top corner.

Wonderful attacking again from the Desert Foxes...

Image source, Getty Images

Image source, Getty Images

Brilliantly done! But he's offside!

What a cross from El Arabi Soudani, he whips it in brilliantly from the left, Islam Slimani is ahead of Jerome Boateng to fire in a low header in off the post.

He was offside though - great call!

Guy Mowbray
BBC Match of the Day commentator

"Germany are rocking at the back, while Algeria are just rocking and rolling. They look so impressive going forward. After the opening we have seen this will not be a simple stroll through to the last eight for Germany.

"Islam Slimani is already looking really dangerous at the sharp end for Algeria and they have come close to threatening the German goal. But you wonder if coming forward might be their undoing if they leave space for the Germans to exploit."

A very promising start. Algeria look like they can get the better of this shaky German defence.

Germany turn the ball over and suddenly there is real danger. Toni Kroos tees up Bastian Schweinsteiger on his left who hits a piledriver, goalkeeper Rais Mbolhi is able to make the save.

At the other end Algeria get in as Sofiane Feghouli turns Jerome Boateng inside out, he drives in on goal and has two men to his left - but fires it wildly over.

Boateng is all over the place at the back.

Gary Lineker
BBC Sport

"The German high-line is bordering on suicidal. Cannot understand why they would play that way with Per Mertesacker."

Algeria in again after a mistake from Jerome Boateng, Islam Slimani puts the pedal down but Per Mertesacker makes a fine tackle this time around.

Algeria have the pace up front. They won't have much of the ball but they have the weapons to hurt Germany...

Former England winger Chris Waddle
BBC Radio 5 live in Porto Alegre

"If the two German centre-halves fall asleep, like they did there, then they could be in trouble. Slimani likes to play on the shoulder, is willing and has plenty of pace. Neuer did ever so well."

That's the ball! Algeria hit the pass they need, long and in behind Per Mertesacker to free Islam Slimani.

German goalkeeper Manuel Neuer meets him 35 yards out, like Rene Higuita in 1990. It could go all wrong for the Bayern man but he makes a cracking sliding tackle in the right-back position.

That's the ball for Algeria though.

MNG: I was 10 in 1982 and it was my first World Cup. Even then l knew the terrible arrangement between the Germans and Austrians had denied Algeria a place in the second round. I know there is little chance but l hope that Algeria come through and right that wrong.

Thomas Muller, with his socks round his ankles, like a young uber-Claridge, is drifting all over the place and seeing plenty of the ball.

The torschutzenkonig - or top scorer - is the danger man.

Steve Lloyd:, external Got to fancy a solid Germany win by a two or three-goal margin. Hoping Algeria can spring a surprise, remember 1982 fellas.

Chad Ogollah:, external Time for a group winner to fall. They all leave it late. If it's not Germany today, then Belgium will.

UTID:, external Algeria to win 1-0. Germany's passing game will fail against the compact Algerians.

Image source, Getty Images

The pattern may have been set early doors, as 21 players are camped in the Algerian half, only Manuel Neuer in the German half. Germany will control the ball but Islam Slimani will fancy taking on Per Mertesacker in a foot race with the ball over the top...

Former England winger Chris Waddle
BBC Radio 5 live in Porto Alegre

"Germany have got the experience and have players playing at big clubs - they've been here many times before. For Algeria, this is where everyone thinks their run ends. But they will be determined, try to frustrate Germany and be dangerous on the counter attack and at set pieces."

The ever-versatile Jerome Boateng has switched to centre-half tonight for Germany and he starts a glowing move which releases Shkodran Mustafi into the channel - but he's offside. Hold the line!