The former La Masia prospect has been offered to Barca this week by agents, with the Catalans not shutting the door.
"I think Sergi is a brilliant player, we all know he has a past there," said Frank.
"What is a rumour or what is true, honestly, I don't know."
It's reported Canos is being considered by Barca coach Xavi thanks to the midfielder's versatility.
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