Install the Contextual Related Posts plugin by Ajay D’Souza and activate. Next proceed to Appearance -> Widgets.
- Drag the Related Posts [CRP] to the After Entry sidebar area
- Set title as desired
- Set No. of posts to 3
- Select Thumbnails inline, before title from the Thumbnails options dropdown
- Thumbnail height should be set to 135
- Thumbnail width should be set to 211