Missed any of this week's Off The Ball? Here's some of the best bits...

Dr. Bennet Omalu spoke to Joe, while the rugby world paid tribute to the retirement of Paul O'Connell

It's been a busy week of sport here and in case you missed any of it, here's a sample of our best bits...

1) Tributes pour in as Paul O'Connell announces his retirement

On Tuesday morning, Paul O'Connell announced his decision to retire from professional rugby, which came as a surprise to many supporters and fans. 

The Munster and Ireland legend had been out of action after suffering an injury at the World Cup, and in a statement released announcing his decision, O'Connell stated that his mind was made up "following medical advice". 

Figure from across the world of rugby paid tribute to a true legend of the game.

2) Dr Bennet Omalu on Will Smith "humility" and why focusing on concussion alone is "misappropriation of science"

Over the last few years, the growing recognition of the threat posed by concussion has started to take hold in American football and beyond.

But one man who has been central to getting the process started was Dr Bennet Omalu, who is portrayed by Hollywood star Will Smith in movie Concussion.

The Nigerian-American physician was the first medical professional to publish findings of the neurological condition chronic traumatic encephalopathy (CTE) in American football players.

Symptoms of CTE include aggression, memory loss and dementia.

This week on Off The Ball, Dr. Omalu joined Joe Molloy to talk about the extent of his work to the point that Hollywood has now taken interest.

3) "You just walked away from death" - The sports trainer who took Serena Williams' career from the brink

As Peyton Manning crowns his career as one of the great quarter-backs and Serena Williams continues to win Grand Slams into her 30s, both American sporting aristocrats have something to thank Mackie Shilstone for.

The renowned sports trainer is credited with working with the duo at a time when both were struggling with physical issues.

This week, he joined Off The Ball to tell us just how he helped them back to their best.