AJ Mass: Oh no, Salvador! It's the injuries that could actually happen to me in my own life that are the most frustrating in terms of fantasy. I'm never going to get hurt running into an outfield wall trying to make a game-saving catch, but, as happened to Salvador Perez, I might actually hurt myself carrying luggage. In fact, I may already have on several occasions -- and missed more than just four to six weeks as a result.
Drew Butera might be able to fill in for the Royals in terms of handling the pitching staff, and he could well provide some pop at the plate, but he's not a guy who can replace Perez in fantasy. If I had to pick someone to step in at catcher for a month or so, I'd go for Robinson Chirinos (rostered in 12.0 percent of ESPN leagues) from Texas. For the whole season, I'm not sure Chirinos, entering his age-34 year, won't break down at some point. But for one month or so, I can indeed see him matching the power production that you would have seen from Perez.
Kyle Soppe: Perez's primary calling card in years past has been the sheer volume of at-bats and the edge in counting numbers that provides, but with him out for at least the next month, the gains on the counting numbers front are all but gone.
If you're looking for a replacement option, why not give Jonathan Lucroy a spin? He is a lifetime .281 hitter and is joining an A's battery that ranked fourth in total home runs last season. I'm fully aware that home run power is not contagious, but this is an offense capable of scoring some runs, and Lucroy's contact-oriented approach should provide nice balance.
The catcher position is pretty ugly after the elite, so the Perez injury isn't going to ruin your season, and you need not panic. Lucroy is available in plenty of leagues while Austin Hedges and Chirinos are also viable waiver options who can contribute without sinking your ship.