It's rare to see a Liverpool player impress and offend Sir Alex Ferguson in equal measure, but Jonjo Shelvey has a Jekyll-and-Hyde quality not always seen among Anfield favourites.
Shelvey's reputation with Reds fans was dealt a blow in 2012, when - in what would end up being his final season with Liverpool - he was sent off against Ferguson's Manchester United. Opposition boss Ferguson was impressed by the Londoner's "balls", though, and the midfield talent has continued to show good and bad elements of his game when returning to Anfield with other clubs.
Now 31, the midfielder might not be part of Nottingham Forest's starting XI after being dropped for last week's defeat against Manchester United. If he features, though, Liverpool will know not to underestimate the England international.