Sanchez was dropped from the starting XI and only came on at half-time in Saturday’s 3-1 Premier League defeat at Liverpool and it was reported that he stormed out off training last week and was also involved in a confrontation with his team-mates.
Wenger, however has described the reports as false.
“But I understand that you have to fill the newspapers and we respect that. When you don’t win the games there are sometimes stories.”
Wenger said tactical factors had been the “unique reason” for his decision to start with Sanchez on the bench at Anfield, where Olivier Giroud and Welbeck started up front.
“His attitude is he’s a committed player,” Wenger said of Sanchez. “Sometimes with excessive behaviours, but he’s been in every squad.
“The definition of a happy person is very difficult. I never found the ideal one.
“On the football front, it is to play well and win. I hope he is happy tomorrow.”
While Wenger tried his best to keep the peace, he did express frustration with Sanchez’s recent performances in Arsenal’s most important matches.
“Sanchez played in all the games when we didn’t perform, at Manchester City, Chelsea,” he said.
“Everybody is a top player at this level. It’s not down to one individual. It’s important we all perform as a team.”
Asked whether Sanchez would return to the starting line-up on Tuesday against Bayern Munich, Wenger said he was yet to decide.
“You will have to come to the game (to find out). I will decide tomorrow morning,” he said.
Arsenal face Bayern Munich on Tuesday where they must overturn a 5-1 deficit to remain alive in the competition.