The University of Michigan has announced that it has paused voluntary workouts for four sports. The athletic department sent out a message late Tuesday night to make the announcement.

Voluntary summer workouts have been halted for field hockey, volleyball, swimming and diving and ice hockey. The school says that a combination of COVID-19 testing results and contact tracing protocols forced the four sports to temporarily suspend the operations.

“With a focus on student-athlete health and welfare, U-M has paused voluntary summer workouts for four sports — field hockey, volleyball, swimming and diving and ice hockey,” the statement read. Ice hockey resumes workouts this week and other programs are scheduled to resume workouts starting the week of August 3.

“Workouts in these sports have been paused due to a combination of COVID-19 test results and contact tracing protocols. Our medical experts are providing the necessary care and communication to individuals who have tested positive for COVID-19 and those who have come into close contact with someone who has tested positive.”

Specific numbers regarding test results for the four sports were not included in the release from the university. According to Angelique Chengelis of The Detroit News there are student-athletes from 18 sports currently on campus.