The 24-year-old's future with Posh had grown increasingly uncertain following the news that the Champions League side had tabled a bid for his services last weekend.
However, the Scottish champions were knocked back in their pursuit of the Englishman - who started the 2-2 draw away to Crewe Alexadra today - but the 41-year-old coach has revealed that he is not dwelling on the disappointment.
"I knew Monday morning he would be fine," he told reporters. "There was a little bit of doubt at the weekend but I was pleasantly surprised at how quickly he dealt with it.
"It was his first experience of it. He's only a young lad and we both had a good chat on Monday morning and I knew he would be fine for the game."
Peterborough missed the opportunity to join Leyton Orient at the summit of League One following the clash with the Railway Men, with a last-gasp Michael Bostwick goal salvaging a point for Ferguson's men.