For starters, Johan Djourou's "nasty bang on the nose" (as described on the official injury news page), suffered during the amazing win over Wigan on Sunday, turns out not to be a break. He's fine, and available to face the Trotters if necessary. With Philippe Senderos having been suspended on Sunday it's possible that he'll play instead. Arsene Wenger may even choose to play them both and give Kolo Toure a rest.

And that's just for starters. Alexander Hleb has recovered from his hamstring injury and is also in the squad. Last we'd heard was that he was due back in training this week, so to hear that he's in a squad so soon is wonderful. But of course, there's a good chance he'll start on the bench.

Hey, but that's not all. The same is true of Freddie Ljungberg whose hamstring has kept him out for rather longer. It'll be very interesting to see if Le Boss sticks with Theo Walcott or decides to bolster the right wing with Alex or Freddie. Given that they're both back, he may well decide to risk one of them, although we know that he's been very wary of bringing people back too early since it went so wrong for Ashley Cole when Wenger was forced to bring him off the bench earlier than planned (in a 7-0 win over Boro at the start of last year, and it led to an injury relapse.

The bad news is in central midfield where Sunday's hero Matthieu Flamini is ruled out with an ankle problem. There have been suggestions that Cesc Fabregas is also out, because of the knock to his knee which we noticed early in Sunday's game but which didn't seem to be bothering him later on. But the official injury news page says nothign about him so perhaps he's ok. If both Cesc and Matty were unavailable, perhaps Abou Diaby would start alongside Gilberto. Denilson's a possibility too but a long shot.

As for the rest of the team, Justin Hoyte plays because Emmanuel Eboue hasn't shaken off his ankle injury, and Gael Clichy on the other side of defence. Manuel Almunia will presumably continue to be our domestic cup keeper.

Up front Thierry Henry is rested, according to the official site's match preview. So it will probably be two from Emmanuel Adebayor, Julio Baptista, and Jeremie Aliadiere. I'd have thought the first two of those, but perhaps with Adebayor on his own at the front of a 4-5-1.

William Gallas is still estimated at 2-3 weeks from playing, but Wenger says he "would not like to put any set time on it".

Bolton have some significant doubts for tomorrow with Abdoulaye Meite and Gary Speed having calf and dead leg problems suffered in Sunday's league win over Fulham. Kevin Davis (ankle) and Abdoulaye Faye (recovering from an abcess op) are both definitely out.

But Ivan Campo has recovered from a virus and with Nicolas Anelka, Nolan, Diouf, Perdersen and Giannocopoulos on the pitch you know it's going to be a tough one.

The replay will go to extra time and penalties if necessary, and the winners play at home in the quarter-final on Saturday lunchtime (also live on BBC1), against Blackburn Rovers.