Ex-Rangers striker Boyd sends warning to Kilmarnock's Shiels - 'Every boss I have gets sacked'
The 29-year old former Rangers striker has seen Gordon Strachan sacked at Middlesbrough, Billy Davies get the boot during his loan at Nottingham Forest and John Spencer given the flick at Portland Timbers.
He is now hoping Shiels is safe after making his return to Kilmarnock where he kicked off his career back in 2000.
"Every manager who's signed me has been sacked - so Kenny had better watch out!," Boyd quipped to SunSport.
"Seriously, there's been a lot of frustration along the way. I went to Middlesbrough then Gordon was out the door which was pretty difficult to take.
"I enjoyed working with Billy at Forest. I thought he was an excellent coach, possibly the best I've worked under. He knows the game inside out.
"At Boro I'd been training knowing I wasn't going to play. I knew I'd be leaving at the end of the season.
"At Forest I got the belief back that I could play and I had a successful time there playing ten games and scoring six goals.
"I really enjoyed it, but then Billy found himself out the door as well.
"I went to Turkey - and, well, what can you say? You get there after signing and the general manager is in jail. Where do you go from there?
"It's part and parcel of life for some people in Turkey, but I wasn't used to it and it was a difficult period.
"When the financial side came into it I knew it was time to get out.
"I went to America and really enjoyed it there. I played from last February through to the end of August.
"At the beginning I felt like I was getting back to where I had been on the pitch. I'd started the season well and was scoring.
"They don't just wake up one morning and decide to sack a manager. Things were ongoing between the club and John Spencer, which I was fully aware of.
"It's difficult, though, when someone gives you the chance then you realise that's happening again.
"Now I find myself back at Kilmarnock and it starts again."