But the club are WRONG to back a player who has been charged with three offences of sexual activity with a child under 16 and one of grooming on Thursday.
What message is Sunderland Football Club putting out?
Advocaat will make a decision on whether or not to involve the 27-year-old England international after discussing the situation with him to ascertain his state of mind.
Asked if the midfielder was available for the game, the Dutchman said: "He's in the squad, yes, tomorrow. If he's in the squad, then I will consider him for selection, otherwise he would not be in the squad.
"He still has to come in, but in principle if he feels okay, then he will be a member of the squad."
Asked if it was a difficult situation for him to deal with as a coach, Advocaat said: "No, because the club made a statement about it and I stay behind that, and we will wait and see what the future will bring."
That statement revealed that Sunderland had not changed their position on Johnson, who has been used as a substitute in the last three games after the suspension they initially imposed was lifted.
It said: "Following yesterday's statement from Durham Constabulary, the club recognises that the formal legal process must take its course and whilst our position remains unchanged, we will keep the matter under review.
"The club will not be making any further comment."
Advocaat is hopeful that Johnson will not be a target for opposing fans as he waits for the legal process to be completed - he is due to appear at Peterlee Magistrates' Court on May 20 - and the Professional Footballers' Association has urged restraint.
In a statement, the PFA said: "Given that this is an ongoing legal matter, it would not be appropriate to comment specifically on the case. However, we would emphasise that just like any other individual, Adam is entitled to a fair hearing.
"We are not in a position to make any further comment."