World number two Simona Halep may not be able to play in next month's Palermo Ladies Open after Italy imposed a 14-day quarantine on people travelling from Romania.
Romanian Halep, 28, was due to compete in the Italian tournament - the first WTA event since March - on 3 August before playing at the Prague Open.
Romania has seen a sharp rise in coronavirus cases in recent weeks.
Tournament organisers have asked for an exemption for players.
Tournament director Oliviero Palma said he had written to Italian Health Minister Roberto Speranza, who has also imposed a quarantine on those coming from Bulgaria.