The Mexican boss was happy with his team following a 2-0 win over Gabon, which propelled Mexico to four points within Group B.
Mexico defeated Gabon 2-0 in the second match of the first stage to climb to the top of Group B pending the South Korea-Switzerland match.
"The team got considerably better in all phases of the game," Tena said in the post-match press conference. "We knew this game was going to be very difficult because we saw Gabon play Switzerland. We haven't received a goal in the tournament and that's something that has us very happy."
Clearly, the key to the game was bringing Giovani dos Santos on in the second half, as the Tottenham player was responsible for both of Mexico's goals. Tena praised his star player for his performance.
"In Gio, we have a player who is getting better, and he's shown that coming in off the bench he can be quite good. He changes the match, even psychologically, everyone around him gets better."
"It would be better for him to have a rhythm at a club level, obviously. Unfortunately he doesn't get the minutes he should at Tottenham."
Once more, the opening duo of Marco Fabian and Oribe Peralta were unable to impact the scoreline prior to Gio's arrival.
"Oribe and Fabian gave their effort, and [Miguel] Ponce is a player who comes in from the back. I think that matches need to be worked on, we can't think we're going to be winning 3-0 by the 20th minute," Tena explained.
"I think that Oribe is raising his level, he's a great player with strength and quality. Today he was able to hold the ball and that's very important."
Finally, Tena warned that despite the win, things would not get any easier for El Tri going forward against Switzerland.
"In the end, we found spaces and won justly. I think we were better than Gabon," he said. "Any team that wins gets stronger psychologically but we're conscious that the toughest step is still there, and that's beating Switzerland."
"We're going to define our passage in the last game, asking for [the referee] to call time and counting goal difference."
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Mike Slane contributed reporting to this story from Coventry.