The duo started in place of Dean Huijsen and Milos Kerkez, both of whom were suspended for the cup game.
20-year-old Soler was replaced by James Hill after 57 minutes, with Senesi coming off with five minutes to play for Daniel Jebbison as the Cherries sought a late equaliser.
The left back had previously played just once for the Cherries, in the cup against West Brom, after joining the club in January, before heading on international duty with the Argentina U20s.
(Image: Richard Crease) Senesi, meanwhile, returned after a long spell on the sidelines after surgery on a quadriceps injury.
Asked about the pair’s performances, Iraola told the Daily Echo: “I think they both played very well.
“Julio basically just has played his second game with us, he hasn't played a lot with us, I would say last two months or something like this.
“And Marcos, coming from a surgery, from a long injury, starting a game.
“I think he has shown big personality. But we knew from the beginning that probably they are two subs that we had to make to finish the game.”