Englishman Bothroyd is out of contract with the Bluebirds and is on the lookout for a new home but Ledley says he could do much worse than come to Celtic Park to don the green and white Hoops.
Bothroyd is gaining interest from clubs in the English Premier League, as Ledley last summer, but the Welshman says it would be smarter for his old mate to move to Glasgow.
"I was in the same situation last year and you have to weigh everything up,” Ledley said.
"Obviously if you're playing in the Premiership you are up against the best players week in, week out.
"At Celtic you are playing in front of 50,000 fans every week and you are expected to win every game.
"There is huge pressure to do well and, of course, you also have a chance to play in Europe.
"There were a few clubs looking at me and I spoke to Stoke, West Brom and Roma.
"Celtic felt right and the gaffer played his part, he really sold me on the club.
"I remember also when I first came to Glasgow. Lennoxtown is a fantastic training centre and then, when you see Celtic Park for the first time.
"You don't realise how big a stadium it is until you come and walk out of the tunnel. It's a great stage to play on. You fall in love with the people and the city.
"Jay will need to think about everything, but it will be his decision and we'll have to respect it whatever it is."