I've been tidying up some of the codebase recently. But I've start to implement the tackle feature.
If an opponent is close enough to the player in possession then they will have the option to tackle, which will reduce their HP and have a chance of taking the ball off them. All I have so far is the UI. purple is the team in possession, yellow are the potential tacklers and red are opposition who can block.

Next is to create a tackle animation, and work out some stats to see if its successful or not.