Knockingrattling noise when taking foot off accelerator

[206glx]

I have a Knockingrattling noise when taking my foot off the accelerator , It does not appear to affect anything just makes the noise!, Car is a 206 GLX, Does anyone have any ideas what this may be or have had it themselves?, I've tried a google search without any clear answer.
Thanks

[valmoz]

Try to check the "engine supports". they might be worn out, so the engine does not sit firmly in place.