One name that has cropped up rather predictably is Arsenal's soon-to-be-out-of-contract midfielder Aaron Ramsey.
He started the season alongside 19-year-old summer signing Matteo Guendouzi, but in recent weeks, Uruguay midfielder Lucas Torreira has been Xhaka's midfield partner, with numerous opinion that this combination is Arsenal's strongest as it stands.
Ramsey, 27, is out of contract at the end of the season and has seen the offer of a new deal rescinded by Arsenal.
Ramsey scored in Arsenal's 5-1 win over Fulham earlier this month and has made over 300 appearances for Arsenal in all competitions.
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Unai Emery has been charged with the task of returning Arsenal to that level, and the Spaniard has made a positive start to that quest. And the club hopes they can use his addition to their advantage to convince Ramsey to sign.
Manchester United, Chelsea, Liverpool and a host of Serie A sides are all monitoring Ramsey's developing transfer situation, with Arsenal in real danger of losing one of their best players to a direct rival.
Ramsey would likely demand huge wages were he to join United.
Jurgen Klopp strengthened his midfield options last summer with the arrival of Naby Keita and Fabinho but with James Milner coming towards the end of his career, the Liverpool boss could be eyeing Ramsey as the ideal replacement.