Mascherano, who has represented Argentina since 2003 and, with 145 caps, has made more appearances than any of his teammates, said the players know they must take a relaxed approach to the game on Tuesday.
Messi led his country to three global major titles - twice in Copa America (2015 and 2016) and in 2014 FIFA World Cup - but ended as runners-up in all the three finals.
Messi has scored 64 goals in 126 appearances for the national side, and all Argentinian's will be hoping he can add to that tally against Nigeria.
Lionel Messi and co. began their World Cup campaign with a disappointing 1-1 draw against minnows Iceland before suffering a humiliating 3-0 defeat to Croatia. Presumably though, Sampaoli will be sacked if Argentina do not make it out the group, a fate they are desperate to avoid.
There have been reports that the squad led a revolt against manager Jorge Sampaoli and senior players will select the team against Nigeria.
"I am convinced that the team will go out tomorrow with a lot of energy to win the game". "There is nothing I can pay them for the past seasons I've been with them other than to say: "Thank you very much". We are getting a great price wagering on Nigeria to win and as result, it is the best bet for this match.
City's all-time leading goalscorer started the tournament with a bang, scoring a brilliant goal against Iceland, but he was substituted in the humiliation by Croatia that left Sampaoli's future in the balance.
"I think scoring against Argentina isn't that hard for me", he smiled after his man-of-the-match performance in Volgograd on Friday.