Kelly has only just recovered from a long-term knee injury.
"Lucas has come back successfully. He had a thigh problem after his ACL injury, so that shows how tough a character he is," Kelly told Liverpoolfc.com.
"He's given me advice in terms of how to take the rehab and how to get over the barrier of throwing yourself back into tackles and getting over the initial injury.
"He's been good with that as a senior player and it's more about dealing with that yourself in the end.
"At a club like Liverpool, you get the support of everyone. As well as your teammates, there's support right through the whole medical staff and the other departments at Melwood.
"They're brilliant. It's been fantastic for me to get back to the physical condition that I'm in now."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball