Interesting info, thanks. This isn't quite true. A player must fully serve his DL time before being eligible for postseason roster injury replacement. A player going on the 60-day DL in late August, such as Mariot above or potentially Graham for the Twins, could be replaced on the 40-man but not give us a "flex spot" for postseason replacement. Finnegan appears to have been added on Sep. 1st last year, although it may have been partially due to a suspended game from August 31: http://www.kansascity.com/sports/spt-columns-blogs/k-zone/article1340533.html I have seen some mention of injury replacements requiring permission from the league, which perhaps wouldn't be automatic for guys not on the 40-man as of August 31st? Finnegan is the only non-40-man as of August 31st example I have found, and as I mentioned he was added Sep. 1st after the completion of a suspended August 31st game. If Berrios was added later, it might be within the rules but it may also be unprecedented. The most famous case, K Rod, was indeed added to the 40-man roster on August 31, 2002, although he wasn't recalled until mid-September. So this rule change appears to be new.