Rantanen received a qualifying offer from the Avalanche on Tuesday, Mike Chambers of The Denver Post reported.
Rantanen played with a fractured leg during Colorado's second-round matchup with San Jose, Adrian Dater of ColoradoHockeyNow.com reports.
Rantanen (upper body) will return to the lineup for Thursday's Game 1 against the Flames, Pat Steinberg of Sportsnet 960 The Fan reports.
Rantanen (upper body) should be in Colorado's lineup for Thursday's series opener against Calgary, Rick Sadowski of NHL.com reports.
Coach Jared Bednar relayed Saturday that he's "hopeful" Rantanen will be featured in the playoffs, Ryan S. Clark of The Athletic reports.
Rantanen (undisclosed) has yet to practice with the team and figures to miss the last two games of the season, per Mike Chambers of The Denver Post.
Rantanen (undisclosed) won't play in Tuesday's game versus the Oilers.
Rantanen (undisclosed) will not suit up for Monday's game in St. Louis.
Rantanen (undisclosed) won't play in Friday's game versus the Coyotes.
Rantanen (undisclosed) remains on the shelf for Wednesday's clash with the Golden Knights, Ryan S. Clark of The Athletic reports.