Although Halladay walked off under his own power players and coaches knew the injury was severe.
``It sounded pretty bad,'' catcher Gregg Zaun said.
"For a month we're going to have to suck it up," Ricciardi said. "We played without him last year. It's not a comforting situation to be in, not having him."
Halladay, who is 12-4 with a 2.41 ERA, leads the American League in ERA. He also leads the league with five complete games and innings pitched (141 2/3). His two shutouts is tied for the league best. The right-hander also ranks second in wins and third with 108 strikeouts.
"We'll just keep our fingers crossed and hope that the other guys pick up the slack, and we keep ourselves in this thing."
Toronto is in fourth place in the A.L. East at 44-42, but is just 5.5 games being Boston. They are in sixth place in the wildcard standings, 4 games behind the wildcard leading Twins.
The Jays are 14-5 in the 19 games that Halladay has started.
The Blue Jays are 14-5 overall in games he starts - leaving them 30-37 the rest of the time heading into Saturday's action - a big reason why they began the day fourth in the AL East, 5½ games behind first-place Boston.
RHPs Justin Miller and Brandon League have been recalled from Triple-A Syracuse. OF Gabe Gross has been optioned down to Triple-A Syracuse.
Miller was 2-1 with two saves in 20 games with Syracuse. In 39 1/3 innings he posted a 2.06 ERA and opposing batters were hitting just .215 off Miller.
League posted a 4-4 record with a 5.71 ERA with Syracuse, however, in 9 games coming out of the bullpen he was 3-0 with a 2.12 ERA.