php - How to pass the data dynamically to post__in

I have below code on my page

$speakersselected = get_post_meta($post->ID, 'speakersselected', true);
print_r($speakersselected); //getting output (587,585)

        $s_post = array(
          'showposts' => 80, 
          'post_type' => 'speaker',
          'post_status'  => 'publish',
          'post__in'    =>$speakersselected,
           //'post__in'    =>array($speakersselected),
            //'post__in'    => array(587,585),
           );
    
       
     echo"<pre>";
     print_r($s_post);  
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Output

if I use'post__in' =>$speakersselected then I am getting below output

Array
(
    [showposts] => 80
    [post_type] => speaker
    [post_status] => publish
    [post__in] => 587,585
)
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if i use'post__in' =>array($speakersselected) then getting below output

Array
(
    [showposts] => 80
    [post_type] => speaker
    [post_status] => publish
    [post__in] => Array
        (
            [0] => 587,585
        )

)
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Both the output not working for me

if i add the static data'post__in' => array(587,585) then it's working for me

Array
(
    [showposts] => 80
    [post_type] => speaker
    [post_status] => publish
    [post__in] => Array
        (
            [0] => 587
            [1] => 585
        )

)
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Any idea how to send dynamic data in post__in?

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