Bamford is preparing for the Premier League promotion playoff final against QPR this week.
He told The Guardian: "Niall from One Direction is a big Derby fan, he came down to the club and I was talking to him.
"Niall said: 'Mourinho knows all about you, he texts me all the time.' I said: 'No he doesn't." He showed me his phone, and because he was doing his treatment at Chelsea, for his knee injury, he knew all the Chelsea boys and Mourinho.
"And he had texts from Mourinho whenever I scored, saying 'Bamford again!' That made me smile. That was the first time I knew that Mourinho knew about me."
For the big stories and the banter follow us on Twitter: @tribalfootball