Sweden goalkeeper Johansson has been linked with Sheffield United, Leeds United and Stoke City.
Evans told the Rotherham Advertiser: "We love him here, but we live in the real world and there are seven or eight big clubs in the Championship who are all looking at him.
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"If he goes on that journey, we wish him every success."
The 25-year-old has played 45 competitive games this season and kept five clean sheets.
Johansson's contract with Rotherham runs until the summer of 2025.