Johnson, who was named the Nationals manager for the remainder of the season on Sunday, will make his debut with the club when it opens a three-game set against the Angels. He last worked as a manager in 2000 with the Dodgers.
"Davey, I feel, is the perfect fit for this job at this particular time," Washington general manager Mike Rizzo said. "He is a guy who has a track record that is beyond reproach. He knows the system. He knows the staff, he knows the Major League club and he is a terrific baseball guy and a proven winning manager."
That proven record includes three World Series titles, including two as a player and one as manager of the 1986 Mets.
While the Nationals, winners of 13 of their past 15 games, will have to adjust to the new addition to the club, the Angels are still trying to get comfortable with all the personnel they have shuffling in and out of the lineup -- particularly at home.
The Angels have stumbled to a 15-20 record at Angel Stadium, despite being one of the best road teams in the league, and are batting just .235 with 14 home runs at home, compared to 45 on the road this season.
"A lot of guys are trying to get comfortable in a lot of ballparks, including our own," manager Mike Scioscia said. "We're talking about the young guys -- Peter [Bourjos], Mark [Trumbo], Hank [Conger] -- and also guys like Vernon [Wells] who are trying to get comfortable in our park."
Angels: Santana better than record indicates
Ervin Santana, who will toe the rubber for the Angels in the series opener, has been better than what his 3-8 record through 16 starts shows, according to Scioscia.
Although the righty has had issues with giving up home runs (15 in 102 1/3 innings), his numbers haven't been that far off from last season, when he won a career-high 17 games. His ERA is up slightly, 4.22 compared to 3.92, but run support has been at the root of his poor won/loss record.
"He's fine. He's definitely throwing the ball well enough to get on a run in the second half of the season -- and we're going to need him," Scioscia said. "Even though his won/loss record isn't very impressive, having seen every start and every pitch he makes, he's hitting spots and his breaking ball is where it needs to be. His stuff looks good -- better than a 4.00 ERA."
Added Santana: "My velocity is very good. My slider sometimes is good, sometimes not so good. My job is to keep the team in games, and I think I've been doing that pretty well. Sometimes things don't go your way and you have to just move on. That's what I do."
Outfielder Torii Hunter (posterior rib contusion) remains day-to-day for the Angels. He has missed three straight games since incurring the injury while running into a wall against the Marlins on Wednesday.
Nationals: Lannan looks to stay hot
While the Nationals have been surging through June, southpaw John Lannan has been just as impressive.
Lannan, who will take the mound in the series opener against the Angels, has won his last three decisions and has recorded six consecutive quality starts. During that stretch, the lefty has allowed only five earned runs, and has a 1.44 ERA in the month of June.
Santana is 9-7 with a 4.22 ERA in 20 Interleague starts, with 112 strikeouts in 121 2/3 innings.
The Angels are 146-113 all-time in Interleague Play, while the Nationals are 125-134, including an 8-4 mark this season.