Kevin Durant is out of the Brooklyn Nets' contest against the Utah Jazz on Tuesday and could reportedly miss the team's next four NBA games as he follows the league's health and safety protocols.

Reports in ESPN stated Durant was exposed to someone who has tested positive for coronavirus and is facing a seven-day quarantine period.

That would see Durant also sit out against the Philadelphia 76ers and the Memphis Grizzlies on Thursday and Friday, as well as Sunday's showdown with the Oklahoma City Thunder.

After opening the season with back-to-back wins, the Nets have lost four of their past five to sit 10th in the early throes of the Eastern Conference standings.

Durant missed the entirety of the disrupted 2019-20 campaign due to a ruptured Achilles and is averaging 28.2 points, seven rebounds and 4.8 assists for the Nets this term.

Juventus defender Alex Sandro has tested positive for coronavirus, the Serie A club announced on Monday.

The Brazil international - who played in Sunday's 4-1 league victory over Udinese in Turin - underwent a test after displaying what Juve described as "mild symptoms". 

Alex Sandro is self-isolating after it was confirmed he has contracted COVID-19, a concern for his club ahead of Wednesday's huge showdown with Milan.

"Juventus announces that following the appearance of some mild symptoms, a check was arranged for the player Alex Sandro, which revealed his positivity to COVID-19," a statement read.

"The player has already been placed in isolation. 

"The club is in contact with the health authorities for the definition of an effective implementation of the protocols needed to allow the training and competition activities of the team."

Alex Sandro featured for 83 minutes against Udinese before being replaced by Gianluca Frabotta, at which stage the hosts were 3-0 up in the game.

The 29-year-old has made seven league appearances under Andrea Pirlo during the 2020-21 campaign, as well as featuring three times in the Champions League group stage.

Juve travel to San Siro to face Milan - the unbeaten Serie A leaders - in midweek, followed by a home game against Sassuolo on Sunday.

Moeen Ali has tested positive for coronavirus upon arrival in Sri Lanka, the England and Wales Cricket Board (ECB) has announced.

Ali and the rest of the England Test squad were checked at the airport in Hambantota on Sunday after flying in ahead of the two-match series, which gets underway on January 14.

The all-rounder will now observe a 10-day period of self-isolation, while team-mate Chris Woakes will isolate for a minimum of seven days after being deemed a possible close contact.

Further testing of the rest of the party will be carried out on Tuesday, with England's players then due to begin training the following day.

"Ali will now observe a period of 10-days self-isolation, in accordance with the Sri Lanka government's protocol on quarantine," a statement from the ECB read.

"Chris Woakes has been deemed as a possible close contact, and he will observe a period of self-isolation and further testing.

"The touring party will be PCR tested for a second time on Tuesday morning. At this stage, the team will train for the first time on Wednesday."

England selected a 16-man squad for the series in Sri Lanka, though seven reserves were also announced for the trip to help cover for potential absences.

The white-ball tour to South Africa in December was cut short due to a number of COVID-19 cases within the bubble shared by the two teams.

While the three-match Twenty20 series against the Proteas was completed, the one-day games scheduled had to be cancelled.

Crowd capacity for the Sydney Test between Australia and India starting on Thursday has been reduced to 25 per cent.

Questions were raised over the venue of the third Test after a coronavirus outbreak in New South Wales.

The clash will go ahead at the SCG, but on Monday it was announced the crowd capacity had been cut from 50 per cent to 25.

"In response to the public health situation in NSW, we are working closely with Venues NSW and NSW Health to put appropriate biosecurity measures in place for our staff, players, match officials, broadcasters and fans to ensure we play the third Test at the SCG safely," Cricket Australia (CA) interim chief executive Nick Hockley said.

"Reducing the capacity of the venue is crucial in achieving social distancing requirements, and we sincerely thank ticketholders for their patience, as we process refunds today, reconfigure the SCG seating plan to deliver these social distancing measures and go back on sale."

The four-Test series is locked at 1-1, with some doubts now over the venue for the final match – due to be held in Brisbane.

Meanwhile, Australia paceman James Pattinson has been ruled out of the Sydney Test due to bruised ribs suffered in a fall at home.