Both the England and Australia squads are due to travel to Sydney on Friday with the penultimate Test starting at the SCG on 5 January.

Head is the first player to test positive during the series, following multiple positives among support staff.

England men's head coach Chris Silverwood will also miss the fourth Test after being forced to isolate for 10 days after a family member in the England camp tested positive.

There have been seven cases in total among England's touring party so far, including three support staff and four family members.

Head has scored 248 runs in the first three Tests at an average of 62 - including a knock of 152 in the series opener in Brisbane.

The 28-year-old is asymptomatic and Cricket Australia says it expects to have him available for the final Test in Hobart.

Mitchell Marsh, Nic Maddinson and Josh Inglis have joined the Australia squad to offer additional cover.

Meanwhile, further Covid cases among teams have put the future of Australia's Big Bash League in doubt.

Friday's Adelaide Strikers v Sydney Thunder game is going ahead, despite four Thunder players testing positive.

The game is likely to take place under what are known as level five protocols - Thunder players need to stay separate from each other and opponents and, when batting, can sit in a group of no more than three.

In addition, seven players and eight support staff at Melbourne Stars have tested positive, putting their next match on Sunday in serious doubt after Thursday's game against Perth Scorchers had to be postponed.