Celtic have the option to sign permanently new Aston Villa loanee Aleksander Tonev.
The Daily Mail says the Villa wide man is available for £1.25million if he proves a success.
Hoops boss Ronny Deila said: "He is has not been playing much at Aston Villa and this is a new chapter for him to get his confidence up and get back to the level he was at before at Lech Poznan where he did very well before he came to Aston Villa."
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