"I didn't know anything about reaching 100 league games," he said. "But I'm obviously chuffed to get there. It is a bit of a landmark, it's an achievement."
Deacon, in fact, is just three short of 150 games for the club in all competitions, illustrating just how well he has progressed in the face of stiff competition since making his first-team debut as an 18-year-old.
Many of his games this season have been at blindside, but Deacon will start a third successive match in the second row when he packs down alongside skipper Leo Cullen at Adams Park.
"The Worcester game a couple of weeks ago was my first start at lock for a while and I felt a bit rusty at the set-piece," the 26-year-old Deacon admitted. "You probably don't realise how fast things happen until you get out of that position and come back into it. And perhaps I was trying to do too much, still thinking about playing in the back row. I have settled down more in the last couple of games and I still feel that lock is my position."
Looking forward to this weekend's encounter, Deacon added: "Wasps away is always tough, though we have had a decent record down there in recent years. They have another big pack - we seem to have all the biggest ones during the internationals - with Worcester and Saracens especially. But from the record we have had there in the past, there is no reason to believe we cannot go and get a good result."