Tierney finished the season with 11 goals and 37 points in 71 games.
Boedker agreed to terms on a two-year deal with HC Lugano on Tuesday.
Nilsson (concussion) passed his concussion baseline testing, Bruce Garrioch of the Ottawa Sun reports.
Borowiecki (ankle) will be available to suit up if the NHL season picks back up, Bruce Garrioch of the Ottawa Sun reports.
Anisimov (upper body) will be ready to go should the NHL regular-season resume, Bruce Garrioch of the Ottawa Sun reports.
Mandolese officially signed a three-year entry-level contract with the Senators on Monday.
Aspirot agreed to terms on a three-year, entry-level contract with Ottawa on Monday.
Kastelic signed a three-year, entry-level contract with the Senators on Thursday.
Balcers' final point before the hiatus came on Feb. 27 against Vancouver, as he failed to score in his final six contests before the virus scare.
Boedker played just 20 games in 2019-20 before the hiatus, but skated in nine games in the final 2 1/2 weeks of action before the virus scare.
Sabourin had just six points on the season as the hiatus occurred, going scoreless in his final five games.
Reilly notched nine of his 12 points this season with the man advantage, including his lone goal before the hiatus.
Zaitsev managed three points in the final seven games before the hiatus, a full quarter of his point total for the season prior to the hiatus.
Hainsey managed just one point in his past 20 games before the hiatus, an assist on Feb. 25 against Nashville.
Borowiecki (ankle) missed the final four weeks before the hiatus, but had posted career highs in both goals (seven) and assists (11) despite sitting for a month.
Paul hit the hiatus having more than tripled his shot totals in a season, notching 20 points in the process.
Tierney finished the year with seven points in his final nine games, his strongest stretch of the year.
Duclair had his first 40-point season since 2015-16, scoring a career-high in goals with 23 in his first full season in Ottawa.
Ryan scored four goals in the eight games following his comeback to cap off what was otherwise a difficult year with a positive note.
Brown scored seven points in his final nine contests of 2019-20, finishing his year with a career-high 27 assists.
Tkachuk's stats in year two almost duplicated year one, as he finished with 21 goals and 23 assists, just one goal short of his maiden campaign.
Chabot has six goals and 39 points while averaging 26 minutes of ice time over 71 games.
Anisimov (upper body) isn't in the projected lineup for Wednesday's clash with the Kings, NHL.com's Dan Greenspan reports.
Coach D.J. Smith said Tuesday that Anderson will start Wednesday's road matchup against the Kings.
Anisimov (upper body) won't be in the lineup for Tuesday's contest against the Ducks.