A team source told The Boston Globe that Spaziani had made the call to start Rettig. However, in a conference call Wednesday, Spaziani told reporters, "We don't know who we're going with yet."
Rettig would start in place of Dave Shinskie. Mike Marscovetra also was in contention to get the start against the Fighting Irish. The two shared time under center in last week's 19-0 loss to Virginia Tech -- Boston College's first shutout loss in 149 games since 1998.
"On Saturday night at 8 o'clock we'll have one of those guys out there. That's the timetable," Spaziani said Wednesday.
"Chase is going to start and Mike and Dave will battle for No. 2," the team source said, according to the Globe. "Chase took about 80 percent of the snaps in practice today."
Spaziani declined to make Rettig or Marscovetra available for interviews.
"It's complicated," the coach said. "They've got a lot of things on their minds."
BC (2-1) went into the season with Dave Shinskie as the starter, but the 26-year-old former minor-league baseball player lost the job after making several bad decisions in the 19-0 loss to Virginia Tech. Shinskie threw two interceptions, one of them in the end zone, and also decided to run for the touchdown instead of out of bounds with time running out before halftime; he was stopped at the 1, inbounds, and BC had no timeouts left to stop the clock.
Spaziani said on Sunday that Rettig and Marscovetra would compete for the starting job.
"It wasn't one game. It wasn't one play. It was a lot of decision-making. We felt we needed to get better now and for the future," Spaziani said. "We've made the change because we weren't satisfied with the production we were getting at that position. So we decided to go in a little different direction here. And what we're expecting is winning performance."
Marscovetra played in four games last year and all three so far in 2010, completing 8 of 13 passes for 92 yards with one touchdown and one interception this season. Rettig is a highly recruited Californian who was supposed to be redshirted this season, but could be pressed into the starting job that neither of the others could keep.
"Whoever they bring in to play that particular role, the player is going to fit with what they are trying to get done," Notre Dame defensive coordinator Bob Diaco said. "I don't know exactly what they're going to do. But other than age, they really all kind of look to be about the same kind of guy physically: big pocket passers, pro-style quarterbacks that can make all the throws, throw it downfield, probably more throw before run, scramble to throw rather than scramble to run."
Asked about the possibility of throwing a freshman out for his first career start against the storied Notre Dame on a national, prime-time telecast, Spaziani said, "You'd prefer not to have that situation. But sometimes what you'd prefer and what needs to be done are not the same."
Spaziani said Shinskie did not enjoy hearing the news.
"I guess people just wanted something new," receiver Jonathan Coleman said. "We knew how hard Dave works in practice. We felt bad for him, people talking bad about him. But the coaches wanted a change, so I guess there's going to be a change."
Defensive lineman Alex Albright said the team would support the decision, whatever it is.
"I'm comfortable with whoever the coaches are comfortable with starting," he said. "I don't know if it's Chase, or Marsco or a walk-on. If they put them in there, I have to be behind them 100 percent."
Information from The Associated Press was used in this report.