The former Liverpool midfielder received criticism from Garry Monk earlier in the season, but seems to have impressed the Swansea manager ever since.
Monk criticised Shelvey for his actions and lack of maturity at the time, but he seems to be happy with his midfielder's performances since his return, as he has been at the heart of a midfield that is well on course to helping the Swans break their Premier League points record.
The Swans boss is quoted in the South Wales Evening Post as saying: "In this game you are either praised or you are criticised — that goes for players and managers alike.
"You have to be able to deal with it and I think Jonjo has done that.
"He has produced the right response and that's pleasing.
"I still think there is a hell of a long way for him to go, because he can get even better.
"It's about trying to make sure Jonjo recognises that, and I think in recent months he has done that.
"Hopefully he takes that into the summer and comes back in really good condition and ready to push on again."
When he left Liverpool for South Wales in 2013, Shelvey was regarded as a very talented footballer but too inconsistent both with his performances and his attitude. One memorable aspect of his time at Liverpool was when he was sent off during a defeat to Manchester United, and afterwards said he would go into the same kind of challenge again.
There is sill that element of rashness to his game, but in recent performances that hasn't been on display as much. Instead, there is much more talk about his ability, and it seems that the message Monk had for Shelvey earlier on in the season is getting through.