Holba was waived by the 49ers on Wednesday, Nick Wagoner of ESPN.com reports.
Holba was released by the 49ers after not suiting up for a single game during the 2020 season.
Holba was signed from the practice squad by the Giants on Saturday.
Holba will take over long-snapping duties with Zak DeOssie (knee) going on injured reserve.
Holba signed a contract with the 49ers on Wednesday, Matt Barrows of The Athletic reports.
Holba will replace suspended long snapper Kyle Nelson on the roster for the time being and reportedly will have the inside track to the job next season as well.
Holba signed with the Jaguars on Tuesday, Mike Kaye of FirstCoastNews.com reports.
Holba is a long snapper who will be brought in following the shoulder injury to Matt Overton. Should Overton be forced to miss any time, Holba will take over long-snapping duties.