Roberts is heading back to his parent club City in the Premier League in England from a loan spell at Girona in Spain.
The youngster did not have a good time at Girona, as he was able to make only six starts and 13 substitute appearances in La Liga, according to WhoScored; he did not score any goal or provide any assist.
The 22-year-old winger was on loan at Celtic from January 2016 until the end of the 2017-18 campaign and was very successful during his spell at the Hoops.
The former Fulham youngster won the Scottish league title three times, the Scottish League Cup twice and the Scottish Cup on two occasions with the Hoops.
Hay has suggested that Celtic should bring back Roberts - who joined City from Fulham in the summer of 2015 for an initial transfer fee reported by The Sun to be worth £4 million.
Hay wrote in The Glasgow Evening Times: “One man that certainly could and probably should be a consideration for Celtic this summer is Patrick Roberts.
“The winger hasn’t really hit the heights we all know that he is capable of in Girona on loan from Manchester City this season, but he did exceptionally well at Celtic in his spell up in Scotland and he is still young at 22.”
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