James started Wales' first Six Nations game against England.
The wing was a controversial choice for his ninth cap ahead of Leigh Halfpenny at Twickenham.
But following Wales' 30-17 defeat - in which James missed a try-scoring opportunity - Halfpenny was recalled at his Blues team-mate's expense for the matches against Scotland, France and Ireland.
James did not feature in the match-day 22 in any of those games, then missed out when Gatland looked to explore his options as he dropped Halfpenny for the Italy Test.
"In conversations following the team announcement for the Italy game [James] indicated to national team management that he was anxious his disappointment about non-selection did not have a negative affect on the squad," said a Welsh Rugby Union statement.
He could find himself slipping further down the pecking order with both Ospreys youngsters Tom Prydie and Kristian Phillips already challenging for places on the summer tour.
Schoolboy athletics star James previously risked the anger of the national management when he was quoted as describing a two-minute appearance in South Africa in 2008 as "pointless" and a "massive disappointment".
At that time he also declared himself better than rival Mark Jones, earning Young's disapproval.
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