Meanwhile, Mancini was going apoplectic on the sidelines, as well he might have done when Javier Garrido, brought in at left-back in place of Wayne Bridge, was forced to clear a Sidibe header from under the bar.
But West Brom were rampant and their lead should have been stretched to three when Peter Odemwingie escaped the attention of Wayne Bridge from Mark Noble's corner, but could only find Green with his close-range header.