Sanchez starts but no Ozil for Arsenal at West Brom
The Chile international starts in attack, alongside Alex Iwobi and Alexandre Lacazette, despite speculation over a possible move to Manchester City in the January transfer window.
There is no place in the squad for Mesut Ozil, though, with the Germany star having picked up a slight knee problem that could leave him in doubt to face Chelsea on Wednesday.
There's no @MesutOzil1088 in #WBAvAFC - he misses out with a slight knee injury pic.twitter.com/R4x5KNfPJX
— Arsenal FC (@Arsenal) December 31, 2017
Wenger, who will set a new record of 811 Premier League matches as a manager in the game at The Hawthorns, became frustrated with questions this week over Sanchez's future.
"When he plays well it's a problem," he said. "When is it not a problem? It's unbelievable.
"You judge a player on whether he played well or not and you comment on it after that.
"I am not a psychologist to know what is in his head, if he is short-term or long-term. You turn up to play football, that's it. After that you judge, did he play well or not well."
Sanchez failed to secure a move to City in the previous transfer window, but there have been suggestions the league leaders could make a renewed push to sign him next month.
Such rumours are likely to persist over the coming days, with Gabriel Jesus picking up an injury in City's 0-0 draw with Crystal Palace on Sunday that manager Pep Guardiola fears could keep him out for up to two months.
Here it is - our team for the final game of the year#WBAvAFC pic.twitter.com/T9uGwaqKjO
— Arsenal FC (@Arsenal) December 31, 2017