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The 49ers have negotiated the framework of trades that would send wide receiver Brandon Aiyuk to the Cleveland Browns or the New England Patriots, a league source told NBC Sports Bay Area on Monday night.

Now it’s up to Aiyuk to determine if he will accept the contract terms from either of those franchises, the source said.

The 49ers gave permission to Aiyuk to negotiate potential contracts with the Browns, Patriots, Washington Commanders and Pittsburgh Steelers, the source said.

After an offseason full of back and forth, the San Francisco 49ers are now willing to listen to trade offers for Brandon Aiyuk and have given the star wide receiver permission to negotiate a contract with other teams.

It represents a significant change for the 49ers, who did not have the same willingness to listen to trade offers at the start of training camp.

49ers coach Kyle Shanahan confirmed Tuesday that Aiyuk has permission to negotiate with other teams but said there’s still a scenario where a deal gets done to keep Aiyuk in San Francisco.

It’s been at this point for a little bit, so nothing really new to me,” Shanahan said.

“You’re always disappointed when you can’t keep hold of all your players or it’s not going exactly right.

I don’t like losing anybody, so that’s why I’m hoping it does work out here. But right now, we don’t have that solved yet. I hope it does.