We're asking for your favourite cup giant-killings...

TeeJay: Newcastle's 2 1 win over Blackburn in 2012. Why an upset? Because it actually got us beyond the third round of the FA Cup.

Image source, Reuters

Atletico Madrid boss Diego Simeone has to decide whether to start striker Fernando Torres against Barcelona in the Copa del Rey or drop him to the bench in favour of the in-form attacking duo of Mario Mandzukic and Antoine Griezmann. Defender Diego Godin is suspended.

"Everyone knows Simeone, and they know how he loves the games and how he prepares them - always to win,'' defender Jose Maria Gimenez says. "That's the energy he gives us, that winning energy.'"

Image source, AP

Away from Bramall Lane, there's a huge match taking place in Spain as Barcelona look to step up their treble pursuit by advancing to the Copa del Rey semi-final at the expense of Atletico Madrid.

Barca, who are one point behind La Liga leaders Real Madrid, lead Atletico 1-0 from the first leg. Boss Luis Enrique is expected to field a strong attacking side including Lionel Messi, Neymar and Luis Suarez. Last season, Barcelona lost in the Copa final to Real Madrid. Atletico knocked out Real in the previous round.

We'll have regular updates from that match.

We're asking for your favourite cup giant-killings...

Frazer Lloyd-Davies:, external Aston Villa, not only beating Bournemouth, but scoring two goals as well! Beautiful stuff!

BBC Radio 5 live

Here is Conor McNamara's view of proceedings at Bramall Lane.

Build-up to tonight's tie is starts at 19:00 GMT on BBC Radio 5 live with Mark Pougatch. There is full commentary from 19:45 GMT with Conor and former Everton and Republic of Ireland winger Kevin Kilbane. Click on the 'Live coverage' tab above.

Sheffield United midfielder Ben Davies does not make the starting line-up. Tottenham full-back Ben Davies does start.

All change please!

Sheffield United make eight changes from the side who drew 1-1 at Preston at the weekend. Only goalkeeper Mark Howard, defender Chris Basham and playmaker Jose Baxter keep their places.

Tottenham also make eight changes from the side which were beaten at home by Leicester in the FA Cup. Harry Kane and Christian Eriksen are two of the notable players who start tonight.

Sheff Utd XI: Howard, Harris, Flynn, Doyle, Murphy, Scougall, Basham, McNulty, McEveley, Baxter, Campbell-Ryce

Spurs XI: Vorm, Walker, Dier, Vertonghen, Davies; Mason, Stambouli; Lamela, Dembele, Eriksen; Kane

Team news coming up....

Image source, @SheffieldStar

The weather might be foul and the snow ploughs are on standby. But this is the hottest ticket in town. It's a 30,000 sell-out at Bramall Lane. Not so popular are the half and half scarves. According to the grapevine, there's plenty still available.

One hour to kick-off and light snow is falling on Bramall Lane. The good news is it's not sticking. And the bad news? Heavy snow is expected later.

Image source, Getty Images

FA Cup semi-finalists last year, League Cup semi-finalists this season. But it's not that long ago that Sheffield United were victims of a giant-killing. As a Premier League club in 2006-07, the Blades were knocked out of the FA Cup by Swansea, who were then in League One.

Bradford and Middlesbrough have hit the headlines for their recent cup heroics but what is your favourite giant-killing memory and why? Remember Altrincham's FA Cup adventures in the 1970s and 80s? And who can forget Sutton's FA Cup victory over Coventry in 1989? Then there's Ronnie Radford's rocket and Mickey Thomas's memorable strike for Wrexham against Arsenal.

Tweet #bbcfootball,, external post a message on the BBC Sport Facebook, external or Google+, external pages or tweet 81111.

BBC radio 5 live commentator Conor McNamara at Bramall Lane

"Welcome to Sheffield."

Bradford City might have hogged the limelight after their stunning FA Cup victory at Chelsea, but Nigel Clough's Sheffield United could eclipse those heroics should they overcome a 1-0 first leg deficit and reach the League Cup final at Tottenham's expense.

Clough's dad, Brian, masterminded four League Cup triumphs for Nottingham Forest between 1978 and 1990. Don't rule Clough Jr out of leading the Blades to Wembley. After all, his players have already claimed three Premier League scalps in cup competitions this term.

No doubt Jose Mourinho has already been thinking about which suit to wear at Wembley following Chelsea's narrow victory over Liverpool in the other Capital One Cup semi-final on Tuesday.

But who will be walking out alongside the 'Special One' on 1 March? Mauricio Pochettino would relish marking his first season in charge at Tottenham with a cup final appearance, but there's an Englishman determined to spring another surprise after a week of cup upsets.

Image source, Getty Images

Remember the last time Tottenham fans had something to really shout about? It's been a long time but mention the 2007-08 season and watch them go all misty-eyed. Dimitar Berbatov and Robbie Keane were scoring freely and an 18-year-old by the name of Gareth Bale became an instant White Hart Lane hero by netting on his home debut against Arsenal.

A productive Uefa Cup run ended in penalty shoot-out heartbreak at the hands of PSV Eindhoven, but a League Cup journey that began with victory over Middlesbrough ended in glorious triumph against Chelsea at Wembley.

Avoid defeat against cup giant-killers Sheffield United at Bramall Lane, and Tottenham can start preparing for a second cup final showdown with their London rivals in seven years.