Although tournament director Nick Freyer did not reveal any names in a recent interview, he did, however, hint about the player close to taking up the offer.
Freyer said a "good name" is likely to get one of the remaining two wild cards, the first of which went to American Bryan Baker.
"In tennis there are two big (comeback) stories this year. One is Bryan Baker and the other is this guy," said Freyer recently.
"He is one of the older players on the tour and has beaten Roger Federer this year. I would rather not give any name at the moment out of respect to him."
Although, Haas, who has surged back into the top 25 of the world rankings at age 34, is not only player to beat Federer this season, the German is, however, the oldest player to have done so.
Federer has also suffered rare defeats to non-top five players this year. The World No 1 lost to Frenchman Jo-Wilfried Tsonga in Doha and American John Isner in the Davis Cup.
Freyer is expected to announce the wild card list later this week.
In mid last year, Haas held the ranking of 896 but improved to 205 at the beginning of this season.
The World No 21 made a great comeback by winning in Halle, where he defeated Federer, who was then World No 3, and reached the finals in Hamburg and Washington.
Haas, who began his professional career on the tour in 1996, broke into the top 100 in 1997 before reaching a career-high singles ranking of World No 2 in May 2002.
His career, however, was plagued by injuries. The German missed the 2003 season and did not return to the top 10 until 2007.
He also missed over a year's tennis between February 2010 and June 2011, but has since returned to play on the tour.
Coached by Christian Groh and married to actress Sarah Foster, the right-handed player who resides in Florida, was hoping to make an impact on the ongoing US Open but bowed out in the first round.
Among the confirmed players for the Malaysian Open are Spaniard David Ferrer, the top seed, Argentina's World No 11 Juan Monaco, Japan's World No 18 Kei Nishikori and last year's finalist Marco Bagdhatis of Cyprus.
The draw for the 32 singles event will consist of 19 players from the direct entry main draw list, three wild cards and four qualifiers. The doubles will comprise only 16 pairs.
Tickets, priced between RM10 and RM100, are available via the tournament's website -- http://www.MalaysianOpenTennis.com or www.ticketcharge.com.my. -www.nst.com.my
