One hundred days. That's all the time remaining before the United States opens the 2026 FIFA World Cup against Paraguay on home soil at SoFi Stadium in Los Angeles. For Mauricio Pochettino and his squad, those 100 days will be defined by two crucial sendoff matches in Atlanta that will determine who makes the final World Cup roster—and who watches from home.

U.S. Soccer announced that Mercedes-Benz Stadium will host back-to-back friendlies against Belgium on March 28 and Portugal on March 31, representing the final competitive fixtures before Pochettino selects his 26-player World Cup squad. The Athletic notes these matches provide Pochettino his last opportunity to evaluate players in match conditions, creating a high-stakes environment where performances could make or break World Cup dreams. "The U.S. gets going with a double-header against a pair of formidable European opponents in Belgium (March 28)—which have not lost a contest in nearly a year—and defending UEFA Nations League winner Portugal (March 31)," U.S. Soccer's official statement emphasized.

The Belgium match presents particular challenges. Kevin De Bruyne's side has been unbeaten for nearly 12 months, riding momentum from their AFCON qualification and Nations League performances. Their blend of technical excellence and physical intensity will test whether the USMNT can cope with the tactical sophistication they'll face in Group B against Paraguay, Netherlands, and Panama. Belgium's "Golden Generation" may be aging, but they remain one of Europe's most dangerous sides—exactly the type of opponent that will expose any weaknesses in Pochettino's tactical setup.

Portugal arrives in Atlanta carrying different but equally daunting threats. Cristiano Ronaldo's presence alone generates massive attention, but the Portuguese squad's depth—featuring talents developed under Roberto Martínez's coaching—makes them genuine World Cup contenders. The 2025 Nations League champions defeated Spain in a penalty shootout to claim that trophy, demonstrating the championship mentality Pochettino wants his USMNT to develop. How the Americans handle Portugal's attacking quality and defensive organization will signal whether they're genuinely ready for the World Cup pressure cooker.

Beyond the Atlanta matches, the USMNT's preparation schedule includes a final warmup against Germany on June 6 in Chicago—less than a week before the Paraguay opener. That timing leaves minimal recovery between facing Germany and stepping onto the World Cup stage, suggesting Pochettino views the German friendly as a dress rehearsal with the tournament squad rather than a final evaluation opportunity. The roster will likely be finalized immediately after the Portugal match, with the June window focused on tactical refinement and team cohesion.

U.S. Soccer has also announced nationwide fan celebrations dubbed "Soccer Forward Fests," designed to build momentum as the tournament approaches. These coast-to-coast experiences reflect the federation's recognition that this World Cup represents more than just sporting competition—it's an opportunity to grow American football culture and demonstrate the sport's rising prominence in the U.S. sporting landscape. The sendoff matches in Atlanta will kick off this celebration while serving the pragmatic purpose of finalizing Pochettino's squad.

ESPN's Herculez Gomez has already begun predicting Pochettino's starting XI for the Paraguay opener, highlighting the intense speculation surrounding roster selection. NBC Sports characterized the current moment as one where "there are more answers than questions," noting that many American players are "thriving and begging for closer inspection from Mauricio Pochettino in March's international window." That depth of talent represents both opportunity and challenge—Pochettino must leave quality players at home, inevitably disappointing those who miss the cut.

The roster announcement itself will unfold at a special event in New York City, befitting the magnitude of the moment for U.S. football. When those 26 names are revealed, they'll represent the culmination of Pochettino's vision since taking over the national team program. The Argentina opener awaits on June 12, just 100 days from now. Between then and now, two matches in Atlanta will determine who gets to live that dream—and who can only watch as the biggest tournament in American football history unfolds without them.