Full time: Preston 1-2 Arsenal
Arsenal scrape through at the last once again after a valiant effort from Preston. Callum Robinson gave Simon Grayson hope of causing another shock but after a succession of first half chances went begging the Gunners took full advantage. Aaron Ramsey scored within a minute of a the restart, before Giroud netted within a minute of the end of normal time. Cruel on Preston, as Arsenal wriggle out of danger once again.
Well that is about all the time we have for on this live text. We'll be back with coverage of all of tomorrow's ties including Liverpool vs Plymouth and Tottenham vs Aston villa. But until then, it's goodbye.
GOAL! Preston 1-2 Arsenal (Olivier Giroud)
Cruel twist of fate for Preston as Arsenal take the lead in the 89th minute. Giroud heads the ball on for Perez, whose delighful backheel is into the Frenchman's path and he steers the ball beyond Maxwell.
Preston essentially down to 10 men for the closing minutes with Ben Pearson suffering from cramp. The home side have made all three subs so the energetic midfielder will have to play through the pain.
Olivier Giroud through he's scored the winner until the flag went up.
Alex Iwobi slaloms through several challenges but his shot it saved easily by Maxwell. Arsenal having all the chances but they can't break through.
Danny Welbeck on for Arsenal, making his first appearance of the season. A welcome return after successive knee injuries. Can he inspire the visitors?
Olivier Giroud celebrates when he thinks is a winner but it won't count. Iwobi clips the ball over the top and Giroud nets on the volley but the flag, correctly, goes up.
Nicely worked corner from Arsenal which almost sees them take the lead. Mustafi meets a near-post corner on the half volley and Maxwell, at the second attempt, makes the save.
Now a booking for Gabriel for leaving his foot in. Game has become a little scrappy in the last few minutes.
Lucas Perez take out by Cunningham, with a hard challenge, which is punished with a yellow card. Simon Grayson not happy but Robert Madeley was adamant.
Paul Gallagher off and Alan Browne on for Preston. First throw of the dice by Simon Grayson. Not been a great start to the second half for the home side.
Here is how Aaron Ramsey pegged back Preston inside a minute of the first half.
Arsenal barely deserve to have restored parity but they have the leveller and Simon Grayson will be devastated, given the amount of chances they created in the first half. Can they weather this storm at the start of the second period?
Ramsey smashes home to draw Arsenal level.
GOAL! Preston 1-1 Arsenal (Aaron Ramsey)
The Gunners take just 48 seconds to equalise at the start of the second half. Aaron Ramsey has space to shoot from 20 yards and it flies past a rooted Maxwell.
Arsenal out early for the second half. Preston have now joined them. Can the Championship convert this position?
Half time: Preston 1-0 Arsenal
Simon Grayson is 45 minutes away from claiming a second FA Cup giant-killing, with his Preston side leading Arsenal but one goal to nil. Callum Robinson got the goal, but in truth it could be two, three or four with a gargantuan amount of chances falling the way of the home side. Arsenal have been rubbish, absolutely rubbish.
Gabriel will need stitches to leave Arsenal will 10-men for the twilight of the first half. Can Preston take advantage?
Blood pouring from the head of Gabriel after a challenge with Hugill, who is booked for his trouble. Arsenal begging for half time.
David Ospina gets the free kick to cut short Preston celebrations as he is floored. A second goal is only what the home side deserve though, and they'll be slightly disappointed they only lead by one.
What is going on at the back for Arsenal. They're a complete mess and Presto once again go within inches of a second goal. Paul Gallagher clips the ball over Ospina, after an exchange with Hugill but Monreal clears it off the line.
For all Preston's pressure, Arsenal should be level. Giroud and Ramsey combine by Paul Huttington get a foot in before Maxwell blocks the follow-up effort. Now Giroud cross across goal but Iwobi can't get onto the ball.
Callum Robinsonn celebrates putting Preston ahead against Arsenal.
Arsenal are being torn apart on Twitter, just as Vermijl comes in on a McGeady cross and volleys wide.