Saturday's 0-0 draw with Kilmarnock saw the club maintain its unbeaten run making it six matches without defeat and not conceding a single goal in the process.
And with no game this weekend due to Celtic's involvement in the Betfred Cup Final, next up for Saints is a home fixture on Wednesday against Craig Levein's Hearts.
If Saints avoid defeat they will continue their impressive record while another shutout would see Zander Clark edge closer to yet another club record.
The manager is delighted for his 'keeper but insists that it's a collective effort from all of his players that has resulted in this superb defensive record.
"I know Zander is getting a lot of plaudits and it's deserved," said Tommy, "but this run of clean sheets is down to the entire squad. Every single player has played their part.
"I believe we've got great partnerships developing throughout the pitch and it has been very important on this run.
"Drey Wright and Richard Foster have developed a fantastic understanding on the right, although we've now lost Drey for the remainder of the season which is a big blow.
"David Wotherspoon has come in to play on the left and I think that's helped Scott Tanser and they work well together down that side.
"And of course the centre-back pairing of Joe and Jason Kerr has worked superbly and I felt that on Saturday they stood out in particular. They were immense.
"They've formed a pretty formidable partnership. They're aggressive, good in the air and like to play the ball out from the back too.
"Defending starts from the front and the strikers have also played a huge part. I'm delighted with how well the players have been performing throughout this run we're on."
Looking back at the injury Drey Wright sustained on Saturday, the manager admits it's a huge disappointment for the club, the player and the supporters.
"He's been immense since he arrived," Tommy said.
"He's got tremendous pace, he's an intelligent player and every game he's been such a threat for us.
"We were looking for him to start adding goals to his game and to lose him now is a big blow.
"His performances have really excited the supporters and I know they'll be gutted for Drey as well. It looked really innocuous at the time but that's often the case with ACL injuries.
"We'll make sure he gets the best treatment so that he returns next season ready to kick on once again."
Despite the loss of one of his key players, Tommy is pleased with the strength and depth he's got at his disposal and believes that there's enough flexibility in the squad to change personnel and systems when needed.
"We'll adapt to losing Drey and we've already shown we can do it this season," the managed said.
"He didn't start against Livingston and we changed our shape. Drey also played in a different role against Motherwell which worked well too.
"We can change things up so whether it means making like-for-like replacements or switching formation, we have the squad and quality to keep things going."
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