Don played for a Scotland 'Future' side in Turkey on Tuesday, while David Noble also got a second half run-out in a 1-1 draw.
"I have got a lot more confidence in Hutch's physical well being - he is there now," says Glenn.
"He had 90 minutes for Scotland on Tuesday against Turkey, which he was determined to do, in midfield, and I was pleased with his contribution at West Brom on Sunday when he came on.
"Because of his versatility he can play as a striker and a midfield player so he is obviously very useful at the moment.
"I am using him from the bench and I know he wants a starting place - and I have told him he has to be that little bit more patient.
"When he gets that starting place, if he plays well, the way Trevor did on Sunday, he will keep his place."
He denies reports that Rangers have made an approach for Don, however, and says: "There was nothing in that, Alex McLeish never picked up the phone to me."
Regarding Trevor, Glenn adds: "Trevor Sinclair was out for a couple of games and he had his best game of the season at the weekend because he doesn't want to be out of the team any more.
"His statement of intent was 'I am back in the team and you are not going to get me out'.
"He scored two great goals and had a fantastic 90 minutes; he didn't stop working and being positive with the ball.
"He wasn't checking back and laying simple balls back to his full back when there was space in front of him.
"He was running with the ball and taking on West Brom's wing-back at every opportunity, which is what we want him to do.
"He got into the box on a number of occasions and because of that he scored two goals - and he was first to admit it should have been a hat trick.
"I had a feeling he was going to play like that. We had had two weeks to prepare after the Leeds game and he had been right on the button with his training and was very focused, very blinkered, even about himself.
"He produced the goods and I am expecting the same sort of performance this weekend from Trevor - and that means I have told you he is playing, anyway!
"We have got competition in the squad, certainly in the midfield areas, and when Kanoute comes back from suspension we will have it in the top half of the team as well.
"Nigel Winterburn will be back and available for the Everton game but Rufus Brevett has proved already he will be a very difficult person to shift out of the left back spot.
"I have been very pleased with Rufus. He is tenacious, gritty and good in the dressing room.
"The lads like him, he is a good trainer, and Nigel knows he will have a fight on his hands to get his shirt back - but I know Nigel wants it to be like that and I know Brevett is up for the challenge as well.
"I told him when he signed he will be in competition with Nigel Winterburn and he said 'no problem'.
"Jean Tigana, he said, signed two full backs in his time at Fulham - Harley and Wome - and he saw both of those off to hold his position. When we took him from Fulham he was in the team.
"And of course we have young Glen Johnson at right back who is doing extremely well and is keeping Sebastien Schemmel of the team, and he knows he has got a hell of a battle to get his place back."
For Tottenham, Robbie Keane is still out with a knee problem, while Milenko Acimovic and Gus Poyet are doubtful after picking up injuries against Fulham on Monday.
Matthew Etherington and Jamie Redknapp could return but Anthony Gardner, Steffen Iversen, Christian Ziege and Chris Perry are out.