Will Lankshear fires but sees his strike deflected out for a corner.

It's delivered to no great avail but it's not cleared out either to allow Stan Mills to flash a cross right in front of goal.

It's begging to be poked into the net but his team-mates aren't quick enough to recognise the opportunity.

Norwich on top at the break but crucially they've not managed to find the goal to give them the lead their dominance deserves.

Mathias Kvistgaarden, Jack Stacey and Kenny McLean have all had chances for the visitors although the scoreboard remains all square.

Eddie Odhiambo
Former Oxford defender on BBC Radio Oxford

That's what we've been calling for, Brodie Spencer getting higher, extra bodies in the box, and it's all square now.

Oxford have got something to work off, they've got a foothold in this game with the goal coming so early, that's exactly what they needed.

Colby Bishop thinks he's been pulled back as he hits the deck in the penalty area but the referee waves away the Portsmouth striker's pleas.

And another one!

Ali Ahmed whips a lovely ball into the box which drops right to Kenny McLean but he can't quite get his foot on it as he jumps to volley into the net.

Anthony Patterson dives to his left and makes the save.

Millwall then go up the other end and almost score themselves as Camiel Neghli crosses in and Tristan Crama heads narrowly wide.

Matt Bloomfield makes two changes for his trailing Oxford side at the break.

Will Vaulks and Hidde Ter Avest are on for the second half.

Yunus Konak and Sam Long make way.

Huge chance and Norwich will be wondering how they are not 1-0 up.

They are so quick on the counter and play out right from the back with Anis Ben Slimane playing Jack Stacey into acres of space down the right.

He runs into the box in a one-on-one but takes probably one too many touches and manages to drag his shot across the empty goal and wide.

Can Pompey hold on for a first win in eight league games with 10 men?

A massive 45 minutes or so to come in the context of the relegation battle.

We are back underway at Fratton Park.

Eddie Odhiambo
Former Oxford defender on BBC Radio Oxford

We need to move them about, Cameron Brannagan and Yunus Konak, you don't need both of them there, push one of them higher up so there's options in front of the ball.

It's about tactical tweaks now.

Femi Azeez has a shot for Millwall but it sort of sums up the game for them so far, as he drags it miles wide of the post.

Image source, PA

Andy Marshall
Former Norwich goalkeeper on BBC Radio Norfolk

That was the best chance of the game so far and those types of chances are the difference between winning, losing or drawing this game.

Is Mathias Kvistgaarden your out-and-out centre-forward?

If he is the centre-forward he has to be taking those chances.

Another excellent chance goes begging for Norwich as Anis Ben Slimane threads the ball through to Mathias Kvistgaarden in the box but he loses his footing and his shot is tame and easily saved by Anthony Patterson.

Millwall on the edge but can Norwich capitalise on this dominance?

Kenny McLean quickly loops the ball forward on the counter for Norwich and he almost releases Mathias Kvistgaarden but he's hauled back by the offside flag, by the narrowest of margins.

Good opportunity for Norwich, almost.

Andy Marshall
Former Norwich goalkeeper on BBC Radio Norfolk

This is all Norwich at the moment, if they take a little bit more care.

The move with Ali Ahmed a few minutes ago is a great example, it takes just that little bit more care.

There's been no real chances at this moment, pick the right pass out and take that care.

Image source, Getty Images

Millwall were starting to string a few passes together of their own but it doesn't quite seem to be clicking for them as Jake Cooper mistimes his pass and it goes out for a throw-in to Norwich.

The Canaries immediately pounce and get the ball straight into the Lions' box - the visitors definitely look the more confident of the two sides at the moment.

No real chances at either end yet at The Den as we approach the 20-minute mark.

Camiel Neghli tries to create something for Millwall, but his little pass through into the box is too heavy for Barry Bannan and runs behind for a goal kick.

Image source, Shutterstock

An electric first half ends with Pompey ahead but down to 10 men.

Keshi Anderson marked his 31st birthday with a first Pompey goal on his first start for the club but Portsmouth's joy only lasted eight minutes before it was thwarted by a red card.

Connor Ogilvie was sent off after a hefty challenge on Stanley Mills and while Portsmouth haven't been made to suffer yet, there's still another 45 minutes to come.

Another absorbing 45 minutes, no doubt.

It's all Norwich at the moment, as they pass the ball around with ease making Millwall work across the pitch.

Lots of patient build-up play from the visitors.