Managerial Notes: Astros, Indians, Red Sox

A few links of interest regarding one managerial vacancy — and two that may be open once the offseason rolls around.

• The Astros were thought to be interested in former Nationals manager Jim Riggleman, who previously worked for Houston GM Jeff Luhnow with the Cardinals, though the sides have not spoken, according to Ken Rosenthal of FOXSports.com (Twitter links). Houston's manager, Tony DeFrancesco, is helming the club on an interim basis following the dismissal of Brad Mills last month, while Riggleman is currently the manager of the Reds' Double-A affiliate.
• Indians GM Chris Antonetti has joined the team in Texas, but he said the visit was scheduled and has nothing to do with a potential shakeup, according to Paul Hoynes of the Cleveland Plain Dealer. When asked about the job security of manager Manny Acta, Antonetti said: "I don't feel any differently than when we talked earlier. I think I'll save any sort of assessments until the end of the season. I think that's probably the best thing to do.
• Red Sox manager Bobby Valentine says he's "the best man for the job" in Boston, Alex Speier of WEEI.com reports. The manager said he has suffered along with Red Sox fans this year and expects to return in 2013.

MLBTR's Ben Nicholson-Smith contributed to this post.