The R's striker says he would be delighted if the Tottenham forward signed for the west London club, even if it meant increased competition for a place in Harry Redknapp's team
Defoe has been subject to speculation linking him with a move away from north London, and the 30-year-old's pitch time at White Hart Lane could be limited next season by the £25.9 million arrival of Roberto Solado.
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"We don't need to speak how big the club is, the club's massive," Johnson told the Daily Mirror. "It's got massive backing, the chairman's been fantastic, it'll be great to give him something back.
"Jermain has worked under Harry before, he's worked with a lot of the boys before. I worked with him for three or four years at England. He's a great lad. He's worked with Jermaine Jenas and few of the old Tottenham boys and there are a lot of people here who could attract him to the club.
"Yeah of course, I think when I've moved to clubs first you look and see who you do and don't know at clubs.
"I think that has an influence on where you choose to go in the end, so fingers crossed and hopefully Jermain will come."