• To slip a pass through means to pass the ball in a very accurate way so that a player is free (usually in a scoring position). The idea behind this type of pass is that it is very accurate - like a slide rule pass.
• Ping the ball means to strike the ball (usually very hard) - here the player has pinged the ball to another player in an accurate manner.
• The phrase 'to come in on his right foot' means that the player moved infield (from the wing) with the ball on his right foot.

Thanks, Damian. The preposition "in" here makes me confused. How does it work?

Janko tries to slide in Rogic with a clever pass in the box but it's blocked.

@hyuna27g_ 

The preposition 'in' is used here to help us understand about where the pass went. To slide someone in means that one player has given another player a pass and they are through on goal; they have a chance to shoot.