"It was probably the worst game of my career," Black said at Werribee's Mercy Hospital on Thursday.
"I didn't train at all in the lead-up to the prelim, but I was right to go by Thursday and I had a half-decent game the week before against Geelong, so I was actually feeling pretty confident.
"The lead-up to the game was pretty frustrating, but there were no excuses really. I just played shocking that game."
Black downplayed the impact his shoulder injury had on his form last season, saying it had affected him mentally more than physically.
"It only hampers you the tiniest bit (physically) but I guess that little bit does mean you lose confidence in yourself," Black said.
"Whereas I might have been getting to balls and marking them the previous year, last year I couldn't get my arm up as much at times, I dropped some marks I should have taken and I let it affect me too much.
"The biggest thing with the shoulder was just that I couldn't do weights properly, so I lost a couple of kilos during the year and my strength dropped away and my marking just wasn't as good as 2013.
"It was frustrating."