Chelsea's goal at the Liberty Stadium came courtesy of Moses, the former Wigan man's first league strike for his new club.
The 21-year-old was among Chelsea's best performers in south Wales, with his pace and trickery proving a constant thorn in the side to Swansea.
And Di Matteo is pleased by the development the Nigeria international is showing.
He said: "He has been doing very well, every time he has played he has performed well. He is still very young but there is a lot more to come from him and I was pleased with him.
"He is a big threat, he has tricks and pace and is becoming more effective when he finds space."