Image source, Getty Images

Here we go then - teams in the tunnel at both games. Let's get it on...

Should Argentina beat Nigeria 1-0 and Iran beat Bosnia-Hercegovina by the same scoreline then who progresses behind Argentina would be decided by the drawing of lots.

Because Nigeria and Bosnia's game finished goalless and the above results would mean they had both conceded and scored one goal the team who goes through will be selected in a draw to be held in the media room at the Maracana Stadium.

The drawing of lots has previously been used in a World Cup but never to decide who goes through from a group.

Live text on a drawing of lots? That could well be a first...

John McEnerney:, external Argentina will come good at some stage, it's impossible not to with those four attackers! SF or Final for them!

Former Premier League striker Jason Roberts
BBC Radio 5 live, Porto Alegre

"It's like a party, not a football match. They call Lionel Messi, Sergio Aguero, Angel Di Maria and Gonzalo Higuain the magnificent four. Nigeria haven't conceded at this World Cup but they'll do very well to keep a clean sheet here."

For my money the Argentina supporters win fans of the tournament thus far. They have made some incendiary noise at both games without seeing a good performance yet.

They are in colourful mood again this afternoon as the players disappear back into the tunnel. Almost time for the anthems - can Messi & co flex their muscles and show the world what they're all about?

Iran are the only team yet to score at the 2014 World Cup.

Iran have never won against European opposition at the World Cup.

But, Iran have scored 16 goals across their five previous matches against Bosnia and Herzegovina. Fill your boots...

Image source, AFP

Nigeria reached the last 16 in both 1994 and 1998 but they've failed to win a game at the finals since.

Interestingly, they have played Argentina in both of their most recent World Cups, losing 1-0 in 2002, and 1-0 again in South Africa four years ago.

So looks like 1-0 to Argentina with Lionel Messi to score then...

Image source, Getty Images

Image source, Reuters

It is possible to score two screamers in two games and still have an average tournament? If so, Lionel Messi has done exactly that.

He was largely anonymous in the 2-1 win over Bosnia right up until he beat three men to lash in off the post for his first World Cup goal in eight years, and then the whole Argentina team were on snooze mode until his fantastic stoppage-time strike saw off Iran and sealed qualification.

Average form of a goal per game? Most people would take that..

Former Premier League striker Jason Roberts

"Woke up to football songs, the smell of smoke and the sound of fireworks...Argentina must be in town."

BBC Radio 5 live

Image source, @Jasonroberts30

Former Premier League striker Jason Roberts will be co-commentator for the Nigeria v Argentina game on BBC Radio 5 live. Build-up starts at 16:30 with full commentary provided by John Murray from 17:00 BST, including updates from Bosnia-Hercegovina against Iran. Click on the 'Live Coverage' tab above.

Now no pressure Bosnia, no stress Iran - but you've got to be scoring four or five goals here.

The three games played at the Arena Fonte Nova have delivered a torrent of strikes, with France sticking five past the Swiss last time out. No time for a drought now...

In a Masterchef style voice, 'team news doesn't get any easier than this.' Both sides are unchanged.

Nigeria: Enyeama, Ambrose, Yobo, Omeruo, Oshaniwa, Onazi, Mikel, Babatunde, Odemwingie, Emenike, Musa.

Argentina: Romero, Zabaleta, Federico Fernandez, Garay, Rojo, Gago, Mascherano, Di Maria, Messi, Higuain, Aguero.

Bosnia's debut World Cup campaign draws to a close. Two narrow defeats at the hands of Argentina and Nigeria mean they're catching the first plane back to Sarajevo after today's match. They make five changes to the side that lost 1-0 to Nigeria. Striker Vedad Ibisevic, who scored the country's first ever goal in a World Cup finals tournament in the defeat by Argentina, starts up front with Manchester City's Edin Dzeko.

Iran name the same side that pushed Argentina all the way before losing to an injury-time moment of magic from Lionel Messi. Carlos Queiroz's men have mustered just four shots on target in their two games so far and have failed to score with any of them. Little matter though, should they win 1-0 and Argentina beat Nigeria by two or more goals the Iranians will be in the second round for the first time in their history.

Bosnia: Begovic, Vrsajevic, Spahic (c), Kolasinac, Besic, Pjanic, Ibisevic, Dzeko, Susic, Sunjic, Hadzic.

Iran: Haghighi, Haji Safi, Hosseini, Sadeghi, Nekounam (c), Shojaei, Timotian, Montarezi, Ghoochannejad, Dejagah, Pooladi.

Bosnia-Hercegovina coach Safet Susic will have endured a few restless nights after criticism in the Bosnian media that he is to blame for their early exit.

Susic favoured cavalier tactics in qualifying, usually fielding an attack-minded 4-4-2 diamond formation. But the 59-year-old changed tack in the build-up to this tournament, dropping Stuttgart striker Vedad Ibisevic to play a cautious 4-2-3-1 system.

So far that switch has blunted their cutting edge - they have had 36 attempts at goal but scored only one, coincidentally netted by Ibisevic as a substitute.

Lawro is backing a draw in Porto Alegre which would be enough to send Nigeria into the last 16 for the third time.

A lot of people, Mark Lawrenson for one, have tipped Argentina to win the World Cup.

With a front four of Angel Di Maria, Gonzalo Higuain, Sergio Aguero and Lionel Messi, you can certainly see why.

They have not played well yet - in fact they've been pretty bad in both games - but they have won them both. The sign of champions?

How far will they go? Who are your favourites to win it? You can let us know by texting us at 81111 (UK Only), tweet us at #bbcworldcup, external or send us a message on Facebook., external

Argentina are already through, and a draw in their match with Nigeria will see them win the group and the Super Eagles qualify in second place. If the African side win, they will top the group.

Iran must beat Bosnia-Hercegovina, and rely on an Argentina victory that is big enough for Iran's goal difference or goals scored tally to better Nigeria's.

Bosnia cannot qualify for the next round.

But let's forget about Luis Suarez. Forget about England's woes. For a few hours at least we are back to the hunt for a place in the last 16.

So far Brazil, Chile, Colombia, Uruguay, Netherlands, Mexico, Costa Rica, Greece, Belgium and Argentina are there.

But who shall join them? First up on the agenda is Group F. Will it be Nigeria or Iran who join the party?

BBC World Service Simon Peeks:, external Argentina fans in good voice and colour on Copacabana beach before the Nigeria match.

The rights and wrongs, the whys and why nots, the what next and where next - Suarezgate III is set to rumble on all summer.

Will he stay at Liverpool? We just don't know.

What we do know is that Fifa are looking into his indiscretion against Italy. Watch this space...