[caption id="attachment_15957" align="alignnone" width="580"]Messi trains with the Argentina team ahead of USA tie. Image Source: dunia-bet.com Messi trains with the Argentina team ahead of USA tie. Image Source: dunia-bet.com[/caption] Internet Desk: Argentina face hosts USA in the semi-final in Houston on Tuesday looking to make the final where they will face either Colombia or Chile depending on the outcome of Thursday's other semi-final. Gerardo Martino’s side have looked untroubled in their passage to the last four, easing past Venezuela 4-1 in the quarter-final after winning all three of their group stage fixtures. Otamendi looks certain to start against USA, having done so in all four of the Albiceleste’s outings so far as part of a defence that has conceded just twice. The 28-year-old also got among the goals with a header that kick-started the 5-0 rout of Panama, but Aguero may have to settle for a place on the bench. Kun scored against Panama as well, but such is the strength at Martino’s disposal that he’s played second fiddle to Gonzalo Higuain of Napoli. Lionel Messi has also been in imperious form since overcoming early injury worries, but USA have good reason to be confident. Beaten 2-0 by Colombia in their opening game, the hosts have improved since and have conceded just once but must face Argentina without the suspended trio of Jermaine Jones, Alejandro Bedoya and Bobby Wood.