Pirlo was interviewed by Reuters Sports at "a promotional event in Manhattan", which I infer was held either after the Portland match or before the team left on the recent road trip.
http://reut.rs/1W6xAmN
Some highlights:
'"[MLS is] a very hard league to play in. It’s very physical, there’s a lot of running. So there is a lot of physical work and to me, in my mind, too little play,” said Pirlo.'
'"We are very happy with what [Vieria] is doing. We are working hard every day, and he is bringing in new things that we are learning,” said Pirlo.
“There is a lot of hard work, both tactically and technically, as well as things that haven’t been done before. The team is really improving and seeing excellent results,” he added.'
The lead-in to the article is Pirlo's opinions on youth soccer development in the US.