Bieber attended the fight at Los Angeles' Staples Center on Saturday, November 09, and took issue with the split decision result, backing Paul by writing, "REALITY .. LOGAN PAUL CHAMPION," in an Instagram post after the fight.
KSI, real name Olajide Olayinka Williams Olatunji, is now ready to fight the "Sorry" singer, should he agree, but thinks the fight would be a mismatch as he'd "destroy" the popstar.
"If Justin Bieber actually wants to fight me, then obviously we'll make it happen," he said during an interview on U.K. breakfast TV show "Good Morning Britain". "Justin Bieber, I'd destroy him, there's no point. Justin Bieber is nothing. He doesn't know how to fight, he doesn't know how to do anything combat sports side. Let him just stick to singing."
Aspiring rapper KSI also wants to take on Bieber on his home turf of music, as he's planning to use his YouTube career to promote his songs.
"For me, I'm going to go and focus on my music. I released a track recently... numbers wise it's doing well," he added. "Music's always a big part of my thing."
Bieber has previously expressed an interest in stepping into the ring, asking Ultimate Fighting Championship chief Dana White to look into promoting a bout with Tom Cruise. That fight has so far failed to materialise, despite boxing legend Floyd Mayweather, Jr. also offering to promote the bout.