"Yes, James will be there," agent Bill Parise said of the NFL's 2008 defensive player of the year.
Both sides remain in constant talks, so there was no need for Harrison to miss the session, according to Parise, as it could lead to unwarranted tension.
Though Parise wouldn't elaborate on the negotiations, he recently told ESPN.com that both sides remained hopeful but far apart.
"We're talking and meeting pretty regularly, almost daily, but we're having a difficult time getting to where we need to be," Parise said last month.
Harrison, 30, is coming off a year in which he recorded 101 tackles, 16 sacks and seven forced fumbles for Pittsburgh.
He made a salary of $1.2 million last season, making him one of the league's best bargains.
So far the Steelers have not been active in free agency while focusing mostly on keeping their own players.
Signing Harrison to a long-term deal is one of the team's biggest internal priorities.
James Walker covers the AFC North for ESPN.com.