The official announcement is expected Thursday.
Charlotte was awarded the 30th MLS franchise Tuesday. The club owned by David Tepper will begin play in 2021.
The veteran left back re-joins the Revolution as a free agent after nine seasons with Sporting Kansas City.
She joined the club as the interim head coach in September.
Kann started two matches for the Five Stripes this past season, including their 3-2 Campeones Cup victory.
Major League Soccer’s Charlotte franchise will begin play in 2021 at Bank of America Stadium.
MacMath will get a chance to compete for the No. 1 goalkeeping position at RSL after Nick Rimando’s retirement
The matches are: Sunday, April 26, Saturday, July 25, Saturday, August 8, Saturday, September 26
After trading for Brooks Lennon two weeks ago, Atlanta United signed the defender to a multi-year deal on Tuesday.
The 29-year-old was previously the captain for Swedish club Ostersunds FK and joins the club on a free transfer at the end of his expiring deal