Belgian newspaper De Standaard reported that Justine Henin would announce retirement on Wednesday afternoon.
The Belgian top seeds remained on course to meet in the final of the Swisscom Challenge.
The defending Wimbledon champion avenged her French Open defeat with a 6-3, 6-2 victory.
Justine Henin's decision to call it quits earlier this month has not so much left a hole at the top of the French Open draw as a gaping chasm.
"I want now to win tournaments I never won before," said the Belgian.
Justine Henin-Hardenne crushed Nadia Petrova 6-2, 6-3 in the semi-final
Clijsters also said she considered Serena Williams and her sister Venus Williams as among her best friends.
World number one Justine Henin set up a dream final against second-ranked Svetlana Kuznetsova after beating Ana Ivanovic at the Sydney International on Thursday.
The Belgian thumped Yugoslav Jelena Dokic 6-0, 6-4 in the final of the Swisscom Challenge on Sunday
The World number two stayed on a collision course with fellow Belgian and world number one Kim Clijsters.
The French Open champions says she is one of the players on the WTA Tour with enough self-belief to challenge Serena Williams.
World number one Roger Federer, chasing the only Grand Slam title to elude him so far, faces gritty Spaniard Tommy Robredo.
Justine Henin and Serena Williams will square up in a battle of former champions at the U.S. Open on Tuesday, while Rafael Nadal and Novak Djokovic headline the action in the men's event.
Justine Henin-Hardenne survived three match points to overcome Kim Clijsters 6-4, 4-6, 7-5 in a thrilling all-Belgian German Open final
A Henin and Jankovic final may lack the pizzazz of a Maria Sharapova-Serena Williams showdown but their records this season are second to none, with the battling Belgian claiming five titles and the Serbian four.
She set up a showdown against Serbian 12th seed Ana Ivanovic later in the day.
Former World No 1 Maria Sharapova suffered a setback on her return from injury when she lost 6-4, 6-3 to Lucie Safarova in the first round of the Madrid Open on Sunday.
Kim Clijsters won the battle of the Belgians on Monday when she beat Justine Henin 2-6, 6-2, 6-3 for a place in the quarter-finals at Wimbledon.
World number one Justine Henin recovered from an early scare to beat qualifier Timea Bacsinszky 2-6, 6-3, 6-3.
Henin maiden Grand Slam success was the result of sublime claycourt tennis and the way she has transformed her once-unhappy private life.
World number one Justine Henin battled back from a set down to overcome Maria Sharapova 5-7, 7-5, 6-3 and retain her WTA Championships title in an epic struggle at the Madrid Arena on Sunday.
The world number one crushed Serbia's Ana Ivanovic 6-1, 6-2 in the women's final.
Top seed Justine Henin of Belgium battled past two-times champion Venus Williams while fourth Russian Svetlana Kuznetsova beat compatriot Anna Chakvetadze in the semi-finals.
The Williams sisters also recorded contrasting wins to advance at the US Open.
She pulled out of the Fed Cup semi-finals against the US as she is not fully fit.\n
Seven-times Grand Slam winner Justine Henin was knocked out of the Australian Open in the third round on Friday, the 11th-seeded 2004 champion losing to Russia's Svetlana Kuznetsova 6-4, 7-6.
Justine Henin's stroll into the Wimbledon quarter-finals, losing just 15 games in four rounds, may not be helping the argument that women are earning their equal share of this year's prize money.
The Belgian, who will succeed Mauresmo as world number one, claimed the first WTA Championships.
Justine Henin is determined to keep her public and private lives separate as she defends her Dubai Open title.
World number one Justine Henin struggled to a 3-6, 6-3, 7-5 win over Czech teenager Nicole Vaidisova to earn a meeting with 19-year-old Frenchwoman Tatiana Golovin, who ousted Italy's Francesca Schiavone 6-0, 6-4.
Justine Henin-Hardenne clinched the year-end number one spot and a place in the final of the WTA Championships when she ended Maria Sharapova's 19-match winning streak.
The top seed proved too good for Croatian baseliner Karolina Sprem in the Family Circle Cup.
Two years after Justine Henin stunned the sport by announcing her retirement at the age of 25 on the eve of her French Open defence, the Belgian is back and eager to show Roland Garros what it has been missing.
Justine Henin continued her impressive return to tennis when she fought back to beat former World No 1 Jelena Jankovic 3-6, 7-6, 6-3 in Stuttgart on Friday, leaving her opponent exasperated.
Australian Open runner-up Marcos Baghdatis lost in five sets to France's Julien Benneteau at the French Open.
Justine Henin and Kim Clijsters steamrolled their semi-final opponents on Friday to set up a tantalising all-Belgian final at the Brisbane International. Henin, playing her first tournament in 20 months after coming out of retirement, crushed Serbia's Ana Ivanovic 6-3, 6-2 in a little over then hour. Then Clijsters, who won last year's US Open after making her own fairytale comeback, demolished Germany's Andrea Petkovic 6-4, 6-2.