According to his Twitter, UFC middleweight fighter Michael Bisping tweeted out the following :

After his [Diaz] defeat at the Weekend, it was stated he went Into the fight Injured with his left arm and was also considering what he would like to do next [due to the fact that, yes he is on a losing streak but his last fights have gone to decisions, which in his own words ‘ How do they score fights nowadays’. ]
Also, Nick will now have to answer to an NSAC hearing due to him failing his post fight medical after his five round fight with Anderson Silva [for which Anderson Silva failed a pre fight medical test before the fight].
Also this was the first time Nick had moved up to 185 lbs – Middleweight division as he is a 170 lbs welterweight fighter. Believing this to be a one time ‘fight’ at the 185 lbs – Middleweight division, but this is Nick Diaz we are talking about!
I, for one hope everything works out for Nick Diaz and he gets his break he actually deserves.
As for Michael Bisping wanting to ‘fight’ him – only time will tell.