All week, Boston Red Sox Manager John Farrell talked about the possibility of Yoan Moncada being promoted to the majors.

Even on Wednesday, during his pregame press conference, Farrell gushed about the player considered baseball’s top prospect.

“There is nothing but positive (effects) … if that were to happen,” Farrell said of a Moncada promotion.

Farrell must have known something because Moncada, 21, was called up Wednesday night by Boston from the Double-A Portland Sea Dogs.

The Red Sox had an off day Thursday and will begin a trip in Oakland on Friday night. Moncada is likely to be in the lineup against Oakland right-handed starter Andrew Triggs. During his time in the minors, the switch-hitting Moncada has batted much better against right-handers (.305) than lefties (.167).

Farrell said Moncada would be playing third base for the Red Sox – a position he just switched to in early August, from second base.

“For those who have been around (the Red Sox) for a number of years, teams that have had success have always had an injection of young players late in the season that have helped carry the team in the postseason,” Farrell said.

“I think Yoan would be in a similar category for when Pedey (Dustin Pedroia) and Jake (Jacoby Ellsbury) came to the big leagues. When Bogey (Xander Bogaerts) came to the big leagues. And (Andrew) Benintendi is obviously already here. I wouldn’t separate him from that comparison at all. In fact, he’s a direct comparison.”

In mentioning Pedroia, Ellsbury, Bogaerts and Benintendi, Farrell has only added to the hype of Moncada.

Now for some history. Pedroia was a late call-up in 2006 but the team was out of contention and he hardly helped (.191). He sparked the team the next year and was named the AL Rookie of the Year.

Ellsbury made his major league debut on June 30, 2007, but didn’t get serious playing time until his September call-up. He took over as the starting center fielder in the American League Championship Series.

Bogaerts was called up in late August 2013. Although a shortstop, he eventually took over at third base for the slumping Will Middlebrooks in the playoffs.

Benintendi was Moncada’s teammate this year, first in advanced Class A Salem and then Portland. He was called up Aug. 2 and eventually became the full-time left fielder before spraining his knee Aug. 24. The Red Sox hope he’s back for the playoffs.

Moncada is not as refined a hitter as Benintendi (especially when batting right-handed) but can make an impact. In 45 games with Portland, he had six doubles, three triples and 11 home runs. His OPS was .910.

If Moncada keeps hitting as a major leaguer, it will likely mean less playing time for Travis Shaw, Boston’s left-handed hitting corner infielder. Shaw is batting .248 with 30 doubles and 14 home runs. But since May he’s batting .208 with 13 doubles and seven home runs.