Teixeira joined the Bees on loan until January but made just two substitute appearances before his deal was ended early.
"Joao came to us at an unfortunate time," Rosler said. "We do not have the same flow to our game as we did in pre-season or at the start of the season.
"Our game is out of rhythm, put it that way, but it will come again. It is difficult for a player like Joao to show us his true potential in that situation.
"I didn't want him to get frustrated. It is not about Joao's qualities, it is the situation.
"The player has gone back and we will concentrate on what we have. We have enough midfield players, we won't replace him."
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