Many are calling for the Everton superkid to be considered for the Euros.
"I feel like I'm in a good place again," Barkley told BBC Sport.
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"I don't have to worry about anything else other than playing games and enjoying training and enjoying my matches and trying to help my team do as good as possible."
On his time with Nice, Barkley also said: "I learned quite a lot (at Nice) to be honest, even though I felt like I should have played a lot more than I did there.
"I learned a lot off the ball. In France, they work hard on the defensive side of the game, really aggressive pressing.
"Some tackles I saw in training were dangerous, even some of the youngsters go right through the older players and didn't even pick them up."