Jordan Botaka made his first appearance for Leeds United's U21 side against Bristol City on Monday, and claimed an assist.
There has been great excitement about Botaka's arrival at Elland Road, but he was not in the squad for the Whites' game at the weekend.
That came as a surprise to some supporters of the club, but Rosler says the decision was made after discussions with Botaka.
The German boss is determined not to throw the tricky winger into his line-up unprepared, and insists that his omission was for the benefit of all concerned.
“Jordan and I had a conversation – he had not trained much in the last 10 days to two weeks,” he said. “He had training sessions on Thursday and Friday and we both were talking about what is the best for Jordan and the best for us.
“We have to put Jordan in a position where he can really live up to the expectation that he has for himself, but also the expectation that our supporters have for him.
“To throw him in would have been unfair. We have to bring him to a level where he can do himself justice. He was part of that decision."
Botaka's first appearance for Leeds, as a result of missing out on Saturday's match against Brentford - which was drawn 1-1 - came for the under-21 squad.
The Democratic Republic of Congo international made a good impression too, setting up Casper Sloth to score the opener in a 3-0 victory.
Botaka's first chance to play for Leeds' senior squad could come tonight, with the side taking Ipswich Town at Elland Road later.