The 40-year-old Australian cricketer, whose wife Jane died in 2008 after a much-publicised battle with cancer, is believed to have presented his 28-year-old girlfriend of seven months with a diamond ring last week.
McGrath's manager told the Sunday Herald Sun: "I can confirm that they're engaged, but that's about as much information as I can give you.
"They got engaged about a week ago. Glenn and Sara haven't spoken to any [magazines]; there's been no story told or anything like that and they're not planning on speaking to anybody about the engagement."
McGrath has a 10-year-old son called James and an 8-year-old daughter called Holly.
