O'Neill spent a decade at Derby County's local rivals Nottingham Forest, during the 1970s and '80s.
Leeds United are said to be in competition with 10 clubs for Gavin Whyte this summer.
Some have questioned Rangers for appointing the inexperienced Steven Gerrard as manager.
Rangers have failed to strongly challenge Celtic in recent times.
Martin O'Neill has warned Steven Gerrard against becoming the new Rangers manager.
Republic of Ireland boss Martin O'Neill has hailed Celtic manager Brendan Rodgers.
Alan Pardew's position as West Bromwich Albion boss is said to be under threat.
The Aston Villa man has been backed to become an Ireland regular.
Stoke City are targeting Gary Rowett and Martin O'Neill as possible replacements for the recently sacked Mark Hughes.
Everton are seemingly closing in on a new manager.