The Phillies signed pitcher Cole Hamels to a six-year, $144 million extension on Wednesday, and the Marlins shipped infielder Hanley Ramirez to the Dodgers in a deal that could have implications in the NL East. The Braves were also reportedly close to acquiring pitcher Ryan Dempster from the Cubs.
"I never worry about what other ballclubs are doing other than being interested in their personnel," Johnson said. "The only thing I'm concerned about is [that] we're going to play Miami in seven or eight days, and I wonder who their personnel's going to be."
Entering Wednesday's slate of games, the Marlins and Phillies sat in fourth and fifth place in the division, 12 1/2 and 14 games behind the Nationals, respectively.
The Nationals will welcome the Marlins to Nationals Park from Aug. 3-5 to play four games in three days. The visitors will feature a new look after dealing Ramirez and left-handed reliever Randy Choate for starting pitcher Nathan Eovaldi and Minor League pitcher Scott McGough.
"I've seen it happen over the years," Johnson said. "It doesn't concern me, to be honest with you. Any time you make a move, you give up something. Maybe it might help you this year, but it might hurt you next year. I don't believe in doing things that just help you today and aren't going to help you tomorrow."