The mean green machine that the Boston Celtics are head coach Brad Stevens' brainchild. A master tactician extraordinaire, at 42-years-old and with six NBA seasons under his belt, you could say that his basketball knowledge is beyond his years.

The organization's worthwhile gamble on the acclaimed former Butler head coach has surely paid dividends with four consecutive playoff appearances since his tenure.

However, for a coach like him, who inches closer each season to the elusive prize, the NBA championship, it seems that failure is not an option anymore.

According to a tweet from Adam Himmelsbach of the Boston Globe, the team might not exactly be where he wants them to be right now.

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image idea: (left to right) kristaps porzingis, joe mazzulla, and jrue holiday looking serious on a Miami city background

Daniel Donabedian ·

Last season, the Celtics were considered to be one of the elite teams in the Eastern Conference with the addition of All-stars Kyrie Irving and Gordon Hayward. An unfortunate series of events led to injuries for both stars, which should have derailed their chances to contend last season. And yet, the mix of seasoned veterans and talented youngsters with the Stevens at the helm kept a tenacious Celtic team that took second seed in the conference with a 55-27 record. They eventually fell in seven games against the Cleveland Cavaliers in the Eastern Finals.

Coming into the season at full strength, Stevens' bar is higher than ever. If a handicapped Celtic team got deep into the postseason, this team should go all the way. For what it is worth, Stevens knows that this team still has a lot of work to do.