Glasgow flanker, John hopes his side can build on their Euro glory run by launching a Magners League title assault.
The Warriors became only the second Scottish team to reach a European quarter-final with a 6-6 draw against English giants Saracens at Hughenden.
In the Sunday Mail, John said: "Holding a club like Sarries was a tremendous achievement and we're looking forward to the next round.
"But before then we have a string of massively important Magners games. We are in the bottom half and are determined to make up the lost ground."