Kontos recently accepted a position with NBC Sports Bay Area for the Giants' pregame and postgame shows, effectively spelling an end to his playing career, Alex Pavlovic of NBC Sports Bay Area reports.
The Nationals released Kontos from his minor-league contract Wednesday.
Kontos signed a minor-league deal with the Nationals on Friday, Mark Zuckerman of MASN Sports reports.
The Cubs reassigned Kontos to their minor-league camp Saturday, Jordan Bastian of MLB.com reports.
Kontos agreed to a minor-league contract with the Cubs on Friday, Bruce Levine of 670TheScore.com reports.
Kontos was sent to Triple-A Scranton/Wilkes-Barre on Friday.
Kontos was designated for assignment by the Yankees on Wednesday, Erik Boland of Newsday reports.
Kontos had his contract selected from Triple-A Scranton/Wilkes-Barre on Monday, Marc Carig of The Athletic reports.
Kontos was traded to the Yankees on Saturday in exchange for cash considerations, Bob Nightengale of USA Today reports.
Kontos was outrighted to Triple-A Columbus on Sunday.