Chile forward Sanchez has been heavily linked with a move to Manchester City and The Guardian reported on Tuesday that the Premier League leaders have lodged an initial £20million bid for a player who is out of contract at the end of the season.
Speaking to Sky Sports before the first-leg meeting with Chelsea at Stamford Bridge, Wenger insisted the 29-year-old was focused on the task at hand.
"You cannot explain every single decision. That is the decision of the day," he said.
"Of course, he is completely focused. He has given a lot recently."
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In 21 appearances across all competitions this season, Sanchez has scored eight goals. His sole outing in the EFL Cup came in the third-round win at Doncaster Rovers.