Duco Events boss David Higgins confirmed this week that they are trying to interest Ortiz in a bout - though it is understood the Ortiz camp has cooled lately.
There could be several issues - Ortiz's No2 ranking with the WBA means he could think he is close to a shot against WBA champion and the man most regard as the best in the world: Ukrainian Wladimir Klitschko. Choice of venue and the purse could also be factors or Ortiz and his handlers may be wary of Tua.
The Tua who lost to Monte Barrett would not be a threat but a fit and motivated Tua would be. The slim pieces of information coming out of the Tua camp is that he is taking this "last gasp" shot at his career highly seriously and is training hard. For whatever reason, Ortiz may be drifting in the likely opponent stakes.
Higgins has previously said Duco got together with Tua on the grounds that he fight a highly rated opponent.
"We have made it very clear that we are only interested in him fighting a credible boxer - we are looking for a top four- or five-ranked fighter - as we do not think it will benefit anyone if he comes back and fights a nobody or a series of nobodies while looking for a title fight," said Higgins in December.
"We have said David needs to get right back up there if he wants to get that title fight and, to do him credit, he has agreed. It's a big thing to consider. You could say he is fighting for his life here, as a win could well get him back on the path but a loss could end his career."
If Ortiz doesn't work out, another option is 41-year-old US heavyweight Tony Thompson. Also a southpaw and a hard-hitting one at that, he has fought 40 times and (other than an early loss), he has only ever been defeated by Klitschko, in 2008 and 2012. He destroyed British heavyweight hope David Price in two rounds in February.
A third option is another US heavyweight Fres Oquendo. Now 40 but still with fast hands and rated fifth by the WBA, Oquendo has, in 42 bouts, lost seven times but has some big names on his CV: Chris Byrd, John Ruiz, Evander Holyfield, James Toney and Oliver McCall. He has lost to that entire brigade and one other - a younger David Tua on his first journey in the heavyweight ranks, in 2002.
Oquendo has apparently always felt he was harshly done by in the loss to Tua; boxing loves a good revenge match.