Christian Pulisic is set to miss AC Milan's upcoming Serie A clash against Fiorentina due to a low-grade right hamstring injury. The injury occurred during the USMNT's friendly against Australia on Wednesday, where Pulisic was forced to leave the pitch in the 26th minute following a tackle from Jason Geria.

Following his return to Milan, an MRI scan confirmed the extent of the injury. The club has announced that Pulisic will be re-evaluated in 10 days, but he is expected to be sidelined for approximately three weeks. This timeline suggests that Pulisic will likely miss Milan's matches against Fiorentina, Pisa, Atalanta and Roma. AC Milan hopes to have him back in shape by November 8, when they face Parma at San Siro.

The news of Pulisic's injury has reportedly caused frustration within AC Milan, with sources claiming the club is "fuming" over the USMNT's handling of the player's fitness. Reports indicate that Milan had cautioned the US coaching staff about minor ankle discomfort Pulisic was experiencing before the international break. Despite this, USMNT head coach Mauricio Pochettino decided to start Pulisic in the friendly against Australia, a decision that Milan executives have allegedly called "reckless". Pochettino has since suggested that the rapid change in climate between Austin and Commerce City, Colorado, may have contributed to Pulisic's injury.

Pulisic's absence is a significant blow to AC Milan, as he has been a key player this season. He has scored four goals in Serie A, placing him among the league's top scorers. His contributions have helped Milan to a strong start in Serie A, where they currently sit third in the table.

The injury also comes at an unfortunate time for Pulisic, as he was enjoying a rich vein of form, even earning AC Milan's Player of the Month award for September. With the World Cup on the horizon in eight months, Pulisic will be keen to return to full fitness as soon as possible. He is expected to be a key figure for the USMNT when the tournament is held in the United States, Canada, and Mexico.

Pulisic will miss AC Milan's home clash against Fiorentina on Sunday. The USMNT's next games are in November against Paraguay on Nov. 15 in Philadelphia, Pennsylvania, and Uruguay on Nov. 18 in Tampa, Florida.