The Swede's first match in charge on Sunday ended a 2-2 draw with Norwich City.
The Gunners are looking to appoint a new manager, but in the meantime, Ljungberg wants to give the entire squad a chance to impress.
He said: "I haven't had a word with the players but for me that's how it works.
"I have been here for three months and last year I was the manager of the under-23s and I saw every game for the first team so I have an opinion about how we can play and what players to use.
"I try to see things like that, everybody has a fair chance and what I see in training and in games is what I will judge them on."