The 41-year-old has secured his first managerial role with the Championship club.
NEWPORT County AFC won't kick-off earlier against Doncaster Rovers in League Two on Saturday because of England’s World Cup quarter-final.
Hayes, who has been working as first-team coach at the south London outfit, will be supported by under-18s boss Jason Pearce, the former Addicks captain. Alongside goalkeeping coach Glyn Shimell, they will oversee the team's FA Cup second-round replay at Stockport on Wednesday. Garner was axed with Charlton sitting 17th in the Sky Bet League One table, having won just five of their 20 matches so far this season.
Charlton have sacked manager Ben Garner, the club have confirmed. The south London side have won just five of their 20 matches so far this season, and club owner Thomas Sandgaard said recent form had left the club in a situation where they "had to act". Garner joined Charlton in the summer after steering Swindon into the League Two play-offs last season.