TEAMS NEWS
Nigeria switched to a 3-5-2 formation for the 2-0 win against Iceland, and could name an unchanged line-up.
Left wing-back Bryan Idowu was replaced by Tyronne Ebuehi at half-time in what appeared a tactical substitution, so it remains to be seen which player starts.
After using a 4-2-3-1 formation against Iceland and a 3-4-3 versus Croatia, Argentina are expected to change once again, with a 4-3-3 or 4-4-2 expected.
Goalkeeper Willy Caballero is set to be dropped after his error versus Croatia.
He is likely to be replaced by the uncapped Franco Armani, who has impressed since joining River Plate earlier this year.
Angel Di Maria and Ever Banega are in contention for recalls, while Gonzalo Higuain could replace Sergio Aguero up front.
 Who needs what? World Cup group permutations
OVERVIEW
Despite a disastrous campaign so far, there is still hope for winless Argentina. Permutations permitting, there is a good chance that three points versus Nigeria will send them through - and the Argentines have never completed afirst-round group stage at a World Cup without at least one victory.
The only time they returned home without a win came in a pure knock-out format in 1934; a squad comprising only amateurs spent over a month at sea only to lose 3-2 to Sweden in the first round and bow out. Should the current team be eliminated in St Petersburg, there would be plenty of Argentina fans happy to see the team - and under-fire coach Jorge Sampaoli - put on the slow boat back to Buenos Aires.
Unlike Argentina, Nigeria's switch to a back three paid off in their last game, a 2-0 win versus Iceland, and another victory would send them through.
NEWS FROM BOTH TEAMS
Argentina midfielder Javier Mascherano: "The relationship with [head coach Jorge] Sampaoli is totally normal, but if we feel uncomfortable, we will raise it, otherwise we would be hypocrites.
"The opposite would be to harm the team, we must seek the collective benefit, we are 23, also those of the squad. We are not playing well and we take charge of the results."
Nigeria coach Gernot Rohr: "I thought before this World Cup we were here to learn. I think this team will be ready in 2022 and this World Cup is coming early, but we have a good chance to win against Argentina."
MY PREDICTION
Nigeria's fate is under their own control, and they may feel they only need a point to progress.
I am not sure that will help them here. They are at their best if they go on the attack, but they seem unwilling to do so.
Prediction: 0-2
MATCH FACTS
Lionel Messi has failed to score with his last 22 shots in matches at World Cup finals
Head-to-head
 In each of the last four World Cups Nigeria have qualified for (2002, 2010, 2014 and 2018) they have been drawn in the same group as Argentina. They were also in the same group in 1994.
 The Super Eagles have lost all four of their previous World Cup games against Argentina, with all of those defeats by single-goal margins (1-0 in 2002 and 2010, 2-1 in 1994, 3-2 in 2014).
 The Nigerians lost a group game to Paraguay at the 1998 tournament, so have been defeated in all five of their World Cup matches versus South American opposition.
Nigeria
 Nigeria's six World Cup wins have all come against European sides - they have never beaten opposition from another continent.
 The only previous time the Super Eagles won back-to-back World Cup games was in 1998, when they defeated Spain and Bulgaria in their first two matches.
 Victory would ensure Nigeria reach the knock-out stage for a second successive World Cup, and for the fourth time in six appearances overall.
 Ahmed Musa is Nigeria's all-time top scorer at the World Cup with four goals - two against Iceland at this tournament, and two versus Argentina in 2014.
Argentina
 The only previous time Argentina have failed to win a game at a World Cup was in 1934 when the tournament was a straight knock-out. They selected an inexperienced, amateur squad, and lost 3-2 to Sweden in the first round.
 They have never completed first-round group stage at a World Cup without at least one win.
 The Argentines are enduring their longest winless run in World Cup history (D2, L2), although that four-match streak includes the 2014 semi-final against the Dutch, which they won on penalties.
 They last lost back-to-back World Cup games in 1994 (against Bulgaria and Romania). They have never lost consecutive games in the opening group stage.
 Lionel Messi has failed to score with his last 22 shots in matches at World Cup finals.
 But over the last two years,he has scored 14 goals in 18 games for Argentina.