Tua Tagovailoa fractured his ribs. He will not be playing Sunday for the Miami Dolphins against the Las Vegas Raiders.

After initial tests showed Tagovailoa had bruised ribs, the Dolphins have announced an updated diagnosis. Further examinations revealed the fractures and the Dolphins have already decided that Jacoby Britt will be starting this weekend.

It is not clear how long Tagovailoa will remain sidelined. Brian Flores, Dolphins coach, did not give a timetable but indicated that Tagovailoa was improving.

Tagovailoa sustained an injury in the second series of Miami’s 35-0 loss against Buffalo last weekend. He was hit by the Bills’ A.J. on a fourth-down play. Epenesa then made his way slowly to the sideline, where a cart was waiting for him to get off the field.

Tagovailoa completed 17 out of 22 passes for an impressive 94 yard and touchdown in the Dolphins’ win over the Raiders last season.

After replacing Tagovailoa last week, Brissett completed 24 out of 40 passes for 169 yard and an interception. Four times he was sacked by the Dolphins’ offense line, as part of a six-sack-yielded game. This figure doesn’t include the play in which Tagovailoa was hurt.