He maintains that the league should consider a postseason tournament.
"The league might consider a weight limit," he said.
As always, the league considered several potential host cities before choosing the Phoenix area.
In the past, Rozelle has said the league would not consider expansion until major problems were resolved.
In April 2011, the league considered expanding up to six members.
But Williams acknowledged that the league should consider changing some of the blocking rules.
The league has considered the problem of slavery and set about securing information from various governments since 1922.
The league is considering a number of rule changes in an effort to increase scoring.
Goodell had also stated that the league did not consider using replacement players.
During his news conference, Goodell was asked if the league would consider taking action against a coach in such a situation.