"There has been trouble in the background," Higgins told the Herald. "Molina is promoted by Don King. Most people would have probably thought that Don King was dead, but oh no, he's still stirring trouble. It was on again and off again, and he was wanting unreasonable terms. Trying to deal with him has been very, very difficult."
Known as the "Lionheart", Leapai is a 39-year-old with a 32-7-4 professional record. By far his biggest fight was a world title challenge against Wladimir Klitschko in Germany in 2014, a fight he lost by technical knockout in the fifth round. Parker beat Brazilian Marcelo Nascimento on the underard. Leapai last fought in August last year.
"He can bang," Higgins said. "He's still in his 30s and the power is the last thing to go in heavyweights. He has a massive overhand right which can knock anyone out cold."
The late change was "not ideal", Higgins said, but added: "If Joe can't beat Leapai, even if the guy is a big puncher, then frankly he shouldn't be thinking about a re-match with Ruiz."
Parker is the only man to have beaten Ruiz Jr, now the WBO, WBA and IBF champion. Parker and his team would obviously love a rematch but first they have to get past Leapai in the first of a three-fight deal with Eddie Hearn's Matchroom. In the short term a rematch against Dillian Whyte is a bigger priority.