"We'll call it a modified contact situation that we can control a little bit before they get fully ramped up, and then we'll just monitor their progress and how they're feeling throughout, and game by game as to whether or not they play."
Both of the Bruins underwent surgeries during the offseason. Krejci had surgery on his left hip on April 25, with his expected recovery time estimated at five months. Krug underwent surgery on his right shoulder on April 21, with his recovery time expected to be six months.
They skated in captain's practices the past few weeks, and were officially cleared to participate in main camp by the medical staff during testing on Thursday.
"We're just going to take it day-by-day and see how it goes," said Krug. "Just take the slow approach - we have some time here before the regular season and that's kind of been the main goal the whole time."
Krug is determined to play in the season opener on Oct. 13 in Columbus.
"Absolutely - I've been working for a long time now, and been making sure that's been possible this whole time and I've been in good hands, so the opener seems like a realistic goal," said Krug. "You never know what's going to happen, and we'll see."
Krejci is also approaching his situation "day-by-day," while eyeing the opener.
"Feeling pretty good," said Krejci. "I've been doing more stuff this week and it feels pretty good. Tomorrow [Friday], obviously with the first day of training camp with the other guys, it's going to be a little more intense, so that's going to tell me a lot about where I am."
Krejci's recovery has remained on track. While it was a tough decision to withdraw from the World Cup of Hockey (after being named to the Czech Republic's roster back in March), it was the right one.
"It wasn't fun, it wasn't an easy decision, it was actually really tough, but here we are and I feel really close to 100 percent," said Krejci.
"I'm going to be almost five months pretty soon," he said. "And before the surgery, five months for me was kind of like where I'll be 100 percent, and I feel that I'm close - I'm not there yet, but I'm close."