Rooney says the Swiss, who arrived at Sunderland from Bayer Leverkusen, stands alongside Liverpool's Hugo Ekitike as the two best additions made this term.
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Speaking on The Wayne Rooney Show, Rooney said: “Ekitike and (Granit) Xhaka at Sunderland have probably been the two best signings in the Premier League.
"I really enjoy watching Ekitike play. His second goal against Newcastle in particular was brilliant, it reminds me of Romario. A little toe-poke goal but it’s instinctive.
“He is the type of player I like to watch. He’s not a number nine, he’s not a number 10. He drifts out wide, he gets on the ball, brings players into the game and he can score goals. So he’s got a bit of everything really.”