The 32-year old Angolan has been at Elland Road since 2005 but is expected to travel to Canada to go over the offer and assess his options in the near future.
"Like hundreds of players, his future's up in the air at the moment, but he has got an offer to go to Toronto. It's a distinct possibility and I'd imagine he'll fly out there in the next few weeks to investigate it," Evans said.
"But it's obviously a big contrast to the club he's with at the moment and a complete change of scene.
"I certainly think that a fully-fit Rui is capable of playing at Championship level and I wouldn't want him to drop below League One.
"We have to take the assumption that he's not going to get another deal with Leeds.
"Any player this close to the end of his contact has to look at his options, but Rui's priority would still be to stay at Leeds."