Anthrax have not named a full-time replacement yet for exiting guitarist Rob Caggiano, but they will at least be covered for their upcoming tours. The band revealed that Shadows Fall guitarist Jon Donais will sit in with the band for their upcoming Fly Festival dates in India, the Soundwave Festival shows in a Australia and the group's headlining slot on the Metal Alliance trek in North America.

Caggiano recently surprised fans by announcing his departure from Anthrax, stating he'd like to concentrate on producing and other studio work. With so many gigs on their 2013 itinerary, Anthrax acted swiftly to add Donais to their touring lineup

"Jon is a bro and he's a total f---ing ripper," says Anthrax guitarist Scott Ian of Donais. "I've worked with him twice on side projects and he tears it up. I'm excited to have him on my right burning up the stage with Anthrax. '13's gonna be a good year."

Donais expresses his excitement at the opportunity, adding, "I grew up on Anthrax. They're the thrash scene, they're one of the Big Four. I'd be crazy to not want to play with them. Initially, Rob called and told me he was leaving the band and asked if I'd be interested in filling in. Then Scott called me and everything fell into place."

The guitarist revealed that he's also working closely with the man he's replacing, as he and Caggiano are using Skype to work on solos and other guitar parts. "He's being great," reveals Donais. "I also have to give special thanks to my band [Shadows Fall] -- Brian, Matt, Jason and Ed -- who have been incredibly supportive and encouraged me to do this."

Shadows Fall, meanwhile, have tour dates scheduled from Jan. 26 through April 19. No word on who will be filling in for Donais on the block of dates that conflict with his stint on Anthrax's trek.

Anthrax 2013 World Tour:

2/16 -- Dehli, India -- Fly Festival
2/17 -- Bangalore, India -- Fly Festival

2/23 -- Brisbane, Australia -- Soundwave Festival
2/24 -- Sydney, Australia -- Soundwave Festival
3/1 -- Melbourne, Australia -- Soundwave Festival
3/2 -- Adelaide, Australia -- Soundwave Festival
3/4 -- Perth, Australia -- Soundwave Festival

Metal Alliance:
3/22 -- Anaheim, Calif. -- House of Blues
3/23 -- Las Vegas, Nev. -- House of Blues
3/24 -- Tempe, Ariz. -- Marquee
3/25 -- San Diego, Calif. -- House of Blues
3/27 -- Los Angeles, Calif. -- House of Blues
3/28 -- San Francisco, Calif. -- Regency Ballroom
3/29 -- Portland, Ore. -- Crystal Ballroom
3/30 -- Vancouver, British Columbia -- Commodore Ballroom
3/31 -- Seattle, Wash. -- Showbox SODO
4/2 -- Denver, Colo. -- Summit Music Hall
4/4 -- Minneapolis, Minn. --- First Avenue
4/5 -- Chicago, Ill. -- House of Blues
4/6 -- Detroit, Mich. -- Fillmore
4/7 -- Cincinnati, Ohio -- Bogart's
4/9 -- Dallas, Texas -- House of Blues
4/10 -- Houston, Texas -- House of Blues
4/12 -- Orlando, Fla. -- House of Blues
4/13 -- Charlotte, N.C. -- Tremont
4/14 -- Silver Spring, Md. -- Fillmore
4/16 -- Cleveland, Ohio -- House of Blues
4/18 -- Philadelphia, Pa. -- Theatre of Living Arts
4/20 -- New York, N.Y. -- Irving Plaza