Those of us without direct access to players etc. can only go on what we read. This article quoting Peter Schwab certainly indicates that Merrett was looking at leaving the club... but remember it as you will!
http://www.afl.com.au/news/2014-09-30/lion-looking-at-options
There's a complicated set of circumstances behind what Schwab said, and none of them involved Dan actually wanting or seeking a trade.
Media game from club and media speculation from random AFL journos can go hand in hand.
Just as one can read about Boards publicly backing coaches' futures and weeks later going back on that.