Pietrangelo, 23, just wrapped up his three-year, entry-level contract and is expected to command a long-term contract worth around $6 million per season.
There is a slight possibility that another team could try to sign Pietrangelo to an offer sheet, which he must agree to, but that isn't a direction the star blueliner is currently considering.
One of Pietrangelo's agents, Mark Guy, told TFP on Friday that reports claiming an offer sheet was pending are not true.
Meanwhile, the Blues have roughly $13 million in salary cap space, with Pietrangelo and right wing Chris Stewart yet to sign.
Blues GM Doug Armstrong has been looking to add a first- or second-line center, but has come up empty via free agency.
The Blues are also engaged in trade talks, primarily involved left wing David Perron and goalie Jaroslav Halak, though as of Friday nothing was imminent.