Aguero is fit again but it's unlikely he'll start on Wednesday. Di Maria is definitely out but could be deemed fit if Argentina reach the final.
This means more of the offensive load will be on Messi...guys like Higuain and Lavezzi will have to step up because Messi will obviously be the main focus of the Dutch defense.
I think Messi can do it. We'd not even entertain this discussion otherwise.
Like I keep saying, I have a bias for extraordinary individuals. And Messi is proving so. Let's see if he can keep it up against a team that is crystal clear a tier 1 team...with a bit of their own magic.
Holland have a complete team. It's sprinkled with Robben and Sneijder.
But I still spell: M-E-S-S-I.
Oddly enough, I think Messi has played a bigger role for Argentina in the last 2 matches (though he hasnt scored) compared to his 3 group stage matches (where he scored in each match). In the group stage, he did not move beyond the opponent's final third of the pitch as he waited for the ball to come to him before attacking. If any other player on the planet played a similar role, they'd be labelled as lazy. However Sabella gave Messi this role to conserve his energy and give him more scoring opportunities. This approach IMO hurt the rest of the Argentina team as they had to defend with 2-3 less players as Higuain, Aguero and Messi had no defensive responsibilities. Also, with Messi playing in such an advanced position, he did not create many chances for teammates.
Ever since the 2nd half vs Switzerland, Messi has dropped back much deeper into midfield and played the #10 role. While he hasnt scored, he has contributed to Argentina's defence (committing 3 fouls vs Belgium) and has created chances for his teammates. He obviously remains a goal scoring threat (as shown by his 1v1 in the Belgium match) but more importantly for Argentina, he is making life much easier for the team's attackers. He assisted Di Maria vs Switzerland, and led the build-up to Higuain's goal vs Belgium. Argentina's attack remains entirely reliant on him but I think it is more prudent for them to rely on him now, now that he is their main play-maker. In the group stage they were relying on him for their offence but had no one to get him the ball.
It'll be interesting to see how Holland defend him on Wednesday. Switzerland double man-marked him. Belgium gave him space to operate. If Holland comes out with a 5-2-3 formation, then I dont expect Messi to be man-marked but Holland will have 4 defenders keeping a close eye on him (assuming Kuyt is allowed to freely roam up the right flank). Another consideration is that Sneijder might be asked to mark Messi in defence, but then Holland will have an advantage in attack as Sneijder will roam forward unmarked (since Messi will not be asked to defend him).
A final consideration is fan support. I believe that Argentina's fans have helped create a winning atmosphere for their team this tournament. All 5 of Argentina's matches have been played in 'home' environments. While these semis will have more of a neutral crowd (more locals and corporate sponsors will be in attendance), I still think Argentina will have majority support just like they did vs Switzerland (which was also played in Sao Paulo).