The 31-year-old boxer faces legendary fighter Pacquiao on August 21 and wants to meet WBO welterweight champ Crawford next.
And he’s suggested that if a match-up with Crawford can’t be agreed he’ll have to move up to fight at 154 pounds
Speaking to Showtime, Errol said: “I definitely want that fight (Crawford), and we’ve just got to make it happen.
“It’s for his guys [Top Rank] and my guys [PBC] to talk to each other and see if it can happen.
"If it can’t happen, I’ve got to move up.”
The likelihood is that Spence will be matched up against the winner of Yordenis Ugas’ next fight.
Ugas is fighting next month on the undercard of Spence vs Pacquaio. However, with an opponent yet to be confirmed some fans have speculated that it will likely be Crawford, which would of course set up a potential bout with Spence rather nicely.
Meanwhile, Pacquiao recently revealed he chose to fight Spence Jr because he wants to “give a good fight to the fans”.
The 42-year-old former eight division world champion could easily have hand-picked an opponent particularly now he’s in the latter stages of his career.
But the future hall of famer said he was refusing to take the easy option as he still wants to test himself against the best.
Speaking to Fox Sports, he said: “There was a lot of opportunity to pick… not an easy fight, but a much easier fight compared to Errol Spence.
“I decided to pick Errol Spence because I wanted to give a good fight to the fans.
“I’m a real fighter.
“Errol Spence is undefeated, young and dedicated to his career.
“He is not an easy opponent.
“He’s the kind of fighter you never underestimate.”
Pacquiao will be aiming to become boxing’s first-ever five-time welterweight titlist as he faces the unified WBC/IBF champ at the T-Mobile Arena in Las Vegas next month.