The Swedish star, 36, claimed his former team-mate at Paris Saint-Germain convinced him a move to the MLS would be great for his career.
"He was like: 'You should come over, go over, and try it out, play there'.
"He said everything is fantastic, it's in progress, but to be part of it is something amazing and something he was proud of.
"So I'm just happy to get all these words because it makes it easier for you when you have to choose whatever you want to do for the next step.
"And like I said, this thing was supposed to happen before but it didn't happen, but it's happening now, so it's the destiny."