The Ibrox chief executive hit the headlines when he made the comment in a radio interview several weeks ago, before opting to stand by the statement in a newspaper article on Sunday.
Rangers wrapped up the championship last week, with McCoist claiming the achievement was the most difficult title he had been involved in as a player, assistant boss or manager with the Glasgow giants.
Responding to Green's remarks after the 4-1 win over Queen's Park at Hampden, McCoist said: "It's also the best Rangers team Charles has ever seen, to be honest. Charles is relatively new to Rangers. He knows the job he's got to do, and we've all got to do, and we're looking forward to doing it.
"In my opinion, it's not the worst Rangers team. I'm not sure how many titles Charles has won in his career but I've been very fortunate to win 14 at our football club, including as assistant manager. That title we were all involved in just there is the hardest one. I know what it takes to win a title. It doesn't matter what division you are in, it takes a special group of people and talent and hard work to win titles.
"We've got a group of boys who were assembled in the space of six or seven days and have managed to win a title and they are 24 points clear. I would think everybody could maybe take a wee step back and offer some congratulations to those boys. I'm certainly doing that right now."
Asked whether he would provide assurances over Green to wary fans, McCoist added: "Charles is more than capable of answering those questions himself to be honest with you. He's never shirked a question and I don't see him doing it now."
A double from David Templeton and goals from Fraser Aird and Kane Hemmings secured the win at Hampden.
McCoist said: "I know the boys have been receiving a fair bit of criticism, a lot of it correctly, over one or two recent performances but I thought we were very good. The level of goal we scored was excellent. I'm a little bit disappointed we lost a goal but it was a comfortable victory for us."
Spiders boss Gardner Speirs said: "I thought we played really well. We made a number of good chances but we were out-done by experience."