Outfielders Roger Bernadina and Corey Brown and first baseman Chris Marrero are all on the 40-man roster, playing in Syracuse and potential callups. Johnson also named second baseman Steve Lombardozzi as a player he would like to see.
"As far as I'm concerned, the last six weeks of the season are really important for this organization," Johnson said. "I'm a firm believer that if you develop properly, the byproduct is winning."
Bernadina is hitting .244 between Washington and Syracuse, with 25 extra-base hits and 27 stolen bases. Brown has 14 doubles, 13 home runs and 34 RBIs through 103 games with a .231 average in Triple-A. Lombardozzi has a .314 average, .363 on-base percentage, 24 stolen bases and 75 runs scored through 115 games as a leadoff hitter with both Double-A Harrisburg and Triple-A Syracuse.
Marrero is the Nationals' seventh-ranked prospect, according to MLB.com, and the hitter who is most Major League ready. He spent the entire season in Syracuse, where he is hitting .309 with 14 homers and 67 RBIs and significantly improved his defense.