Make no mistake about it, the San Antonio Spurs offseason to-do list is long. Re-signing their in-house free agents Tim Duncan, Boris Diaw, Danny Green and Patty Mills remains their priority.

Their ability to lure another free agent will depend largely on how much less Duncan's salary be next season, and how much will they have to pay to get back the services of Diaw, Green and Mills.

If the Spurs somehow make a manuever, leaving them enough of the bulk of the mid-level exception (assuming they get under the luxury tax after re-signing their own free agents), then San Antonio could make a run at another free agent to improve their roster.

Should Duncan, Diaw, Green and Mills stays, San Antonio's immediate need will be adding another big man to deepen their frountcourt rotation that includes Tiago Splitter, DeJuan Blair and Matt Bonner.

Of the three, Splitter remains San Antonio's best low post threat besides Duncan. Blair can rebound and hustle, but his lack of size gives the Spurs some disadvantages particulary on the defensive end, while Bonner is essentially a stretch big.

There are a bevy of free agents bigs available in the market, but the Spurs front office must pull of some more tricks on their sleeves to make it happen. 

Luring Erazem Lorbek to San Antonio remains a possibility but his current contract and his ability to transition in the NBA remains a question.

Having said that, here is a list unrestricted free agent bigs the Spurs could target.

Ersan Ilyasova (2012 salary: $ 2,541,000) - He played solid basketball for Milwaukee last season averaging 13.0 points and 8.8 rebounds in 27.6 minutes per game.

It's hard to imagine the Bucks letting him walk without giving him his due, a lot of NBA teams will be interested in getting his services. The Spurs will surely love a hard working young big man that can score and rebound.

Anthony Randolph (2012 salary: $ 2,911,231) - Played only 34 games for the Timberwolves last season, but managed to averaged 7.4 points and 3.6 rebounds in just 15.2 minutes per contest. 

Minnesota seem not interested to keep him, he still needs consistency and bulk up to be a legitimate low-post threat, but the Spurs could always add a young and versatile big man in their roster. 

Spencer Hawes (2012 salary: $ 4,051,024) - He averaged 9.6 points and 7.3 rebounds in 37 games for Philadelphia last season but he has proven his worth in the playoffs. The Sixers will likely do whatever it takes to keep him, and many NBA teams will covet a young and talented center, but if he remains available, the Spurs should at least try to bring him to San Antonio.

Chris Kaman (2012 salary: $ 14,030,000) - Averaged 13.1 points and 7.7 rebounds last season, but appears to slow down at the age of 30. He will not get a $ 14 million offer he earned last year and if other NBA teams shows little interested, the Spurs could use a big man that bangs inside the paint and has experience.

It's hard to think about signing other free agents right now since the Spurs haven't done their homework on their own free agents yet. 

However, it is no secret that the Spurs are trying to find ways to add another big man to fortify their frontline next season, Ilyasova, Randolph, Hawes and Kaman are few of a bevy of free agents out there in the market.

If San Antonio could somehow get the services of one of these players, they could expect better things next season. Nonetheless, they will always have competition from other NBA clubs, but that is where the genius and creativity of the Spurs front office comes in.

What are your thoughts?

Should the Spurs try to get one of these free agents? Who will fit in well? Which player has the most legitimate chance of landing in San Antonio?

Tell us what you think.

(Photo via ESPN/NBA)