Admitted - it's a bit of a stretch to attribute Mertesacker's bruised and damaged ankle to the vague presence of James McClean, but I've watched the clip of McClean's goal on Saturday about 50 times and I have no other explanation for Mertesacker's collapse, beyond a mucky pitch.
[youtube]http://www.youtube.com/watch?v=W2w2LMt8ejo[/youtube]
[Photo via Arseblog]