According to the Republic:

That a position player is coming back up would seem to make sense. Since the initial trigger was Tony Clark going on the DL, an infielder - Callaspo - would seem to be the most obvious choice. However, if it does turn out that Quentin has been called up, and rumour suggests that's the case, it might raise a flag that Green or Gonzalez are being traded elsewhere. This would fit in with the findings of our current poll, in which a clear majority (54%) think Green is more likely to be dealt than anyone else.

If Callaspo gets the call instead, it may simply be as injury cover, but the same could still apply (if Hudson or Counsell, say, were the trade targets). For it does make sense to get the replacement called up in advance of the trade, and get them accustomed to life in the majors. But the Diamondbacks would not be doing this unless a deal was all but assured; starting their contract clock as a speculative move, doesn't make any sense.

Another possibility, not raised by the Republic, is that Scott Hairston might come straight back to the big club. Unlike the two previously mentioned, he is already on the 40-man roster. However, as he doesn't seem to have played any games for Tucson yet, I think it's unlikely he'll get to do his rehabbing in the majors. Anyway, interesting times, and a bunch of trade rumblings involving the Diamondbacks floating about. More on those later, I just wanted to get this one up there ASAP...

Update [2006-7-20 14:37:41 by Jim McLennan]:
From the Piecoroblog: