"He was playing for the under-17s when I was here and I promoted him to train with the first team," revealed Sousa.
"I'm happy for him but not so happy for me. He's a good prospect for the future."
Nathan Dyer had fired Swansea into the lead just before the hour mark after a hopeful ball from Guillem Bauza hit Rangers defender Matt Hill and fell into his path.
But German climbed off the bench to hit the leveller from close range after fellow substitute Rowan Vine drilled the ball across the area.
The point was enough to lift Swansea up to fourth, but Sousa felt his side should have run out comfortable winners.
Dyer also hit a post in the first half while Bauza missed a gilt-edged chance when he fired weakly at Rangers keeper Carl Ikeme.
"We needed to be more clinical. We had four or five big chances but at 1-0 anything can happen," added Sousa.
"I don't think it was a fair result - we had a lot of chances to conclude the game."
Neil Warnock, Rangers' sixth manager since Sousa's departure, predictably disagreed and felt his side were worth their point.
Sousa had added further spice to the encounter by criticising the physical nature of Warnock's teams in the build-up to the match.
"I did tell the players not to tackle today so as not to upset Paulo," smiled Warnock.
"I told them it would be a horrible game, as Swansea don't give anything away, and that they would have to be patient.
"It was an enjoyable second half, Antonio took his goal well and it was a good fightback.
"It was interesting to see them under some pressure because they had been so composed - it was nice to ruffle a few feathers."
Rangers are now six points clear of the relegation zone and Warnock is already looking to stamp his mark on the club next season.
"It's difficult, we've got six or seven loan players so I'm excited about bringing my own players in," he added.
"We won't be having six or seven loan players next season, that's for sure.
"I'd like to keep two or three of them though - if we've got a few million."
Source: Team Talk
Source: Team Talk