Tomlin released a statement of his own, saying his “respect and love for the Pittsburgh Steelers will never change”.
“This organisation has been a huge part of my life for many years and it has been an absolute honour to lead this team,” he added.
“Coaching in Pittsburgh is unlike anywhere else and I will always take great pride in having been a steward of this team.
“I am excited for what the future holds for this organisation and I will forever be grateful for my time coaching in Pittsburgh.”
Tomlin guided the Steelers to their sixth Super Bowl title in 2008 and made the play-offs 13 times during his tenure.
However, their defeat to Houston was the seventh consecutive postseason defeat and fans had voiced their displeasure at his coaching during the season, chanting ‘Fire Tomlin’ at games.
The departure of Tomlin means the Steelers will be looking for only their fourth head coach since 1969.
It also represents the ninth NFL coaching change since the conclusion of the regular season.