Details have not yet been provided – but the band have asked for fans to offer their best wishes.
They say in a statement: “At present the severity of Biff’s injuries are unknown and doctors have advised him strongly not to perform.
“Saxon are extremely sad at disappointing fans in Portugal, and hope they can come back soon.”
the veteran NWOBHM outfit are currently touring in support of 20th studio album Sacrifice. Byford recently told KNAC: “We’ve always thought of ourselves as a unique, groundbreaking band, but I thought we lost that spirit a little bit in the 90s.
“We’ve certainly got it back again. That’s the way we look on ourselves: we try to write songs and create music that’s unique.”