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8/25/2014 8:06 P.M. ET

Farrell offers suggestions to improve expanded replay

TORONTO -- Red Sox manager John Farrell said he agrees with the spirit of Major League Baseball's replay review rules, but he'd like to see at least one change for the 2015 season.

Speaking to reporter's prior to Monday's series opener against the Blue Jays at Rogers Centre, Farrell said the league should consider having one designated official, separate from the umpiring crew, decide which plays merit a review.

"I think that would be the most objective and most consistent," Farrell said.

Farrell said there continues to be confusion about which plays are reviewable and which ones aren't. He found it interesting that Joe Maddon protested the Rays-Blue Jays game on Saturday based on the rules of an instant replay.

"There's still some clarity to be had, even to date," Farrell said. "There's been some recent plays where we've been informed a certain part of a play isn't reviewable, then it's reviewable."

Still, Farrell said he agrees with the end goal of the replay review system.

"I'm in full agreement of the spirit of the use of instant replay, and that's to get the calls right, and yet we're still working through the first year of usage," he said.

Ortiz's foot better, but held out of starting lineup

TORONTO -- The bruise on David Ortiz's right foot kept him out of the lineup in Monday's series opener against the Blue Jays, but the Red Sox slugger said he felt lucky to have escaped with only a day-to-day injury.

Ortiz fouled the ball off the top of his foot in the fourth inning of Sunday's game against the Mariners, causing him to drop to the ground in pain. Ortiz remained in the game until the sixth inning, but he wasn't able to continue beyond that point.

Big Papi said on Monday he's feeling a lot better, especially considering he thought his foot was broken.

"I think I got away with [something] right there," Ortiz said. "That ball I hit off my foot -- I hit the ball off my foot all the time -- but I think that was like the worst I've ever hit a ball of my foot. I went down to the ground. It was a pitch that was cutting in, so it felt like the same velocity that the pitch was coming in was the same or more than hit my foot. That's why it hurt so bad."

Ortiz said the foot swelled up pretty bad overnight, but after taking anti-inflammatory medication after breakfast and getting a few more hours of sleep, the swelling had gone down.

Despite that improvement, Ortiz said he wouldn't be available on Monday in any capacity because he's not able to hold much weight on it.

"He's not in the lineup, he's not taking [batting practice], but hopefully with another 24 hours, there's a likelihood he would come back tomorrow," manager John Farrell said.

Ortiz will be a noticeable absence from the Red Sox's lineup in Toronto. Ortiz is 18-for-37 in his past 11 games despite Boston's current slump, and he holds the record for most home runs by a visiting player at Rogers Centre with 37.

Several factors will determine where Castillo debuts

TORONTO -- Where Rusney Castillo will report once he gets his work permit has still not been determined, manager John Farrell said on Monday.

The Red Sox signed the Cuban outfielder to a seven-year deal on Saturday, but he won't be able to suit up until his working papers are complete. At that point, several factors will come into play when deciding where to send him.

"I'm sure there's a more detailed plan, but we're taking it one step at a time until the paper work is done," Farrell said. "Whether that begins in Fort Myers, [Fla.,] timeline of available games and who's still playing, who's in the playoff stretch, all of those will be factored in."

Once he finally makes his ascent to the Major Leagues, Castillo will have a mentor in Red Sox slugger David Ortiz, who said he's looking forward to playing alongside someone who seems like a "great kid."

"Those players from Cuba, at that stage, they know how to deal with things," Ortiz said. "They know what they're doing and that's why they come up to the big leagues and perform at the highest level. It's good for him to have guys like myself, Spanish speaking, where I can help him with some things and get him comfortable around here."

Castillo, who hasn't played a game in nearly a year and a half after being suspended following his first defection attempt, played five seasons in Cuba's Major League, Serie Nacional, posting a career on-base percentage of .383, a .516 slugging percentage and an .899 OPS.

Worth noting

• Allen Craig got the start at first base on Monday. It was Craig's first time at the position as a member of the Red Sox, though he's played there 210 times in his Major League career.

"He's taken some ground balls, but it's been minimal [since he joined the Red Sox]," Farrell said.

• Brock Holt will start at shortstop as long as Xander Bogaerts is sidelined with a concussion.

• Carlos Rivero had his contract selected from Triple-A Pawtucket to replace Bogaerts and joined the team in Toronto on Monday.

"He's a guy that's capable of three infield positions, plenty of arm strength. Best used at the corner, but can also play shortstop if needed," Farrell said.

Jamie Ross is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.