Brassard likely will play for the Charlottetown Islanders of the Quebec Major Junior Hockey League this season.
Tampa Bay also signed 21-year-old forward Joel Vermin to a three-year, entry-level contract. The Lightning selected the Swiss native in the seventh round (No. 186) of the 2013 NHL Draft. Vermin had 13 goals and 35 points in 47 games with Bern of the Swiss A-League last season.
"Curtis is a first-round pick and obviously a player and prospect that we think has a good upside," Senators general manager Bryan Murray told the team's website. "We're trying to get our best players tied up and he is certainly one of the guys of the future in this organization so we're very, very happy to get him signed at this point."
The 17th pick of the draft, Lazar had 38 goals and 61 points in 72 games with the Edmonton Oil Kings of the Western Hockey League last season, and then had nine goals and two assists in 20 playoff games.
It's not just going to happen on its own. We have to have guys commit to the areas we need to improve on. We're going to be better than last year but there is still a long way to go. But I really like the pieces and where we're headed.
— Sabres forward Tyler Ennis on the progress of Buffalo's rebuilding process