The Royals’ manager Brian McDermott confirmed after the game that the 25-year-old made the decision not to join up with the rest of the squad as they slipped to a 3-0 defeat.
Guthrie has since been fined two-weeks’ wages for his actions, and said sorry to the club and their fans:
“I hold my hands up and apologise. It’s something that we will deal with internally,” he is quoted by the Reading Post.
“There’s no problem with anyone. I have my reasons for what happened, it shouldn’t have happened, but it did. My head just wasn’t right.”
The ex-Newcastle man went on to insist that he is happy at the Madejski Stadium and not considering moving on in January:
“I love being at this club – I just want to play football,
“I’ve never had problems anywhere I have been and I just want to get back to playing football.
“This is a very rare situation for me.”
Guthrie began his career with Manchester United, before switching to Liverpool as a youth player.
After making just a handful of appearances for the Reds, he moved on to Newcastle, where he became a key first-team player.
He moved to reading during the summer as part of McDermott’s plan to keep the club in the Premier League.