WATCH: David Luiz PUNCHES John Terry in the nuts as a training ground prank

Everyone knows Chelsea's David Luiz enjoys a training ground prank from time to time.

But this one is probably a bit of a low blow… quite literally.

After club captain John Terry was struck in the nether regions by a football during training, the former England defender went over to a member of the Chelsea medical staff to check everything was present and correct.

In stepped Luiz, who did everything he could to make matters worse - by punching Terry in the gentleman's agreements, causing more harm to Terry's tackle.

Watch the video below.

When you get the ball clean in your 🥜 and your checking all is ok until... @davidluiz_4 does this 🙈😂

John Terry (@johnterry.26) 分享的帖子 · 2017-04-6，7:03 PDT

Terry didn't look too impressed, but you imagine Luiz isn't a man you can stay angry at for too long.

Still, spirits in the Chelsea camp look like they are comfortable with them being Premier League leaders, despite Tottenham Hotspur continuing to breathe down their neck.

Chelsea travel to Bournemouth on Saturday, while Spurs welcome Watford in Saturday's early kick-off.