Little Mix`s album Glory Days ends the year as the number one album.
Clean Bandit`s Rockabye remains at number one in the singles charts for an eighth week.
Michael died aged 53 at his home in Goring-on-Thames, Oxfordshire and police have said that a post-mortem examination into the cause of his death was "inconclusive".
His retrospective album, which topped the chart for eight weeks upon its release in 1998, sees a 5625% surge on sales and streams from last week.
It was already one of the 60 best-selling UK albums of all time and now re-enters the album chart top 10 for the first time in 17 years.
Michael`s last album with Wham!, The Final, is at 40, while Twenty Five, Faith, Symphonica and Older have all returned to the top 100.
Four of his singles, including 1987`s Faith also return to the top 100 singles chart.
Last Christmas has returned to the top 10 for the first time in 31 years and is the second most-streamed track of the week with 3.6m streams.
Official Charts Company boss Martin Talbot said: "The sudden and terribly sad death of George Michael has naturally prompted his fans to re-explore his rich catalogue again, paying tribute to his incredible talent, both as a solo artist and founder of Wham!.
"Quite appropriately, given the season, it is Last Christmas which makes the biggest impact."
Little Mix`s Glory Days, which includes the hit single Shout Out To My Ex, reaches number one for a third time.
Last month it became the fastest-selling album by a British girl group since The Spice Girls` Spiceworld in 1997.
More about:
