The All England Club said the 27th-seeded Konta was determined to have been in close contact with the team member and so is required to self-isolate for 10 days.
Konta next meets either Czech fourth seed Karolina Pliskova or Greek qualifier Maria Sakkari, who beat the British number one on clay in the final of the Moroccan Open earlier this month.
Dominika Cibulkova adopted an aggressive style of play against the Johanna Konta, keeping her on the edge and forcing errors out of her.
Stan Wawrinka stunned Bulgarian sixth seed Grigor Dimitrov 1-6, 7-6 (7/3), 7-6 (7/5), 6-4 on Centre Court.
Caroline Wozniacki had to battle hard to book her place in the quarter-finals at the Eastbourne WTA tournament.
Simona Halep was distracted by the call and looked to umpire Kader Nouni to rule the point to be replayed.
Konta fought back to beat Halep 6-7 (2/7), 7-6 (7/5), 6-4 and now faces five-time Wimbledon champion Venus.