Andy: It's almost as if the players know the game can't really get going until Ramos gets a red card. He's trying to avoid it. Psychological stalemate. A classic El Clasico stand off.

Gyimah: Emlyn, has there ever be a goalless four halves in the history of El Clasico?

Yeah, in 1973 two consecutive Clasicos were goalless. That's the only time there's been two 0-0s in a row

Barca are on top again after the restart. Lionel Messi finds Nelson Semedo, whose cross is stepped over by Arturo Vidal but nobody is there behind him.

Barca play the free-kick short and then Lionel Messi's cross is headed away by Casemiro.

Real midfielder Casemiro shoves over Lionel Messi. Free-kick from crossing range.

Not much. Gerard Pique heads over - and the referee blows his whistle for a foul so it wouldn't have counted anyway.

Barca get a corner soon after the restart. What can they do with it?

Cristiano Ronaldo is watching the game from a box. Get him on the pitch NOW.

The second half begins.

Some goals, please. Thank you in advance.

Right, I'm calling it now. Martin Braithwaite to come on and score the winning goal.

A promising stat...

Of the last 26 goals scored in league Clasicos, 19 were netted in the second half.

Real Madrid have failed to score in the first half of nine of their last 11 La Liga matches.

Lionel Messi has failed to score in each of his last six (and a half) away appearances in all competitions. The last away goal he scored was at Atletico Madrid on 1 December.

If he does not score in the second half, this will be his worst away run since September 2006 to March 2007 (eight games).

If this ends in a draw, Barcelona will retain their two-point lead on Real Madrid at the top of La Liga.

With both games ending in a draw, goal difference would be used to separate them if they end the season level on points.

Image source, .

Three halves of El Clasico football this season. No goals.

The referee doesn't even bother with injury-time. The half-time whistle goes.

Real midfielder Casemiro is down injured and the referee blows his whistle to stop play. But he's back on his feet now.

Free-kick to Real on the left wing as Marcelo is fouled - but they don't make anything of the free.

Brandon: Finally Barca seem to be attacking! Lots of space out wide for both sides, and neither team looks stable at the back. Both sides throwing everything forward not holding back

I think Real Madrid will definitely be happy to hear the half-time whistle.