Can anyone make sense of this tie?

NINE GOALS. And there's still another 20 minutes of extra-time left.

Pat Nevin
Former Everton and Scotland winger on BBC Radio 5 Live

Extraordinary - a brilliant finish again. Left foot, far corner, 5-4, that double substitution that Jose Mourinho was going to make before, he's definitely going to do that now.

Bernard has put Everton back ahead in the crazy game.

Here's how the first eight all went in...

Harry Kane has sight of goal and is falling as he lets fly but Robin Olsen is well placed to make the save. No sign of either side taking it easy. Both are going for this.

Now it's Everton's turn to attack. Hugo Lloris stretches to claim a cross by Richarlison before Dele Alli heads away another ball pinged into the danger area.

Nice spell of Tottenham pressure before Dele Alli loses possession on the edge of Everton's penalty area. Jose Mourinho will not like that.

Harry Winks has come on for Tanguy Ndombele.

Everton get extra-time under way. More goals to come?

Pat Nevin
Former Everton and Scotland winger on BBC Radio 5 Live

Loved every second of that - it's a freezing cold night and I've not felt it. I've not even thought about it it's been that exciting a game. Both teams deserve the extra 30 minutes to have a real good go at it. Right now, Everton are second favourites in this one because of the attacking might that Spurs have got on the pitch at the moment.

Sheffield United

Image source, Getty Images

Sheffield United boss Chris Wilder speaking to BBC Sport: "It was an awkward tie for us in the position we're in and the opposition had nothing to lose. We were a bit sloppy in the last five-ten minutes with a few misplaced passes and at that stage we should've been out of sight. But we're through we're into the next round, into the quarter-final again and hopefully we can use this momentum as we have done previously to see if we can pick some points up in the Premier League.

"A win's a win. We haven't had enough of them this season that's what the message was to the players. We were good in the first half, but we missed some good opportunities. We opened them up numerous times but they were stubborn opposition. The manner if our goal will be debated and it might look like a tight game but we always looked comfortable and like were going to go through to the next round."

On penalty decision: "It was an opportunity for us to score, we were disappointed we didn't score in open play because we had a couple of opportunities in that section there. I didn't know he'd be sent off as well but we'll take any decision that goes our way."

Great news, folks. We've got another 30 minutes of this extraordinary tie to come. Will it be settled in extra-time? Or are we going to penalties?

Corner for Tottenham. Seconds left.

Pat Nevin
Former Everton and Scotland winger on BBC Radio 5 Live

It's looked more and more likely that Spurs are going to score as the game has gone on. Neither team will want extra time, considering the stresses of it. This has been a very high tempo match and there might yet be an extra thirty minutes.

Harry Kane goes in late on Tom Davies. He gets away with that.

Tottenham have a huge game against Manchester City at the weekend. Can they settle this in normal time? Five additional minutes.

Janet Hopper: I know it's not giant killing but Magic of the Cup it's bonkers! Roll on a spurs win on pens

Adam Conflict: this is a proper cup tie

Tottenham are going for a winner in normal time. Son Heung-Min, who has been exceptional, goes for goal. Wide.