The 28-year-old midfielder was signed from Celtic for £6.5million 11 months ago and struggled to make a telling impact in his first season at Villa Park on a consistent basis.
McGill said: "I spoke to Stiliyan the other day and he literally rang me to tell me how well things were going. He is happy with the new signings, he´s happy with the training and he´s been very bullish about the whole thing."
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