Moore, 26, was signed to a one-year, $1.85 million contract with the Browns. The former second-round pick by the Broncos of the 2011 draft lasted four years in Denver before joining the Texans as an unrestricted free agent.
Unfortunately, he was released after just one season in Houston. The Browns signed Moore to a contract back in March only to cut him loose before the start of the season.
In 2015, Moore appeared in seven games for the Texans and recorded 16 tackles, one interception and two pass defenses before he was later benched. Pro Football Focus has him rated as the No. 56 safety out of 88 qualifying players.
Whitner, 31, is a former first-round pick of the Bills back in 2006. After five years with the Bills, Whitner signed on with the 49ers and later joined the Browns in 2014.
He was in the third year of his four-year, $28 million contract when he was cut loose by the Browns back in April.
In 2015, Whitner appeared in 14 games and recorded 81 tackles, 1.5 sacks, a forced fumble, no interceptions and four pass defenses for the Browns. Pro Football Focus has him rated as the No. 24 safety out of 89 qualifying players.
Allen, 34, is a former fourth-round pick of the Buccaneers back in 2004. He spent six year in Tampa Bay before signing on with the Steelers back in 2010.
Allen has been testing the open market as an unrestricted free agent, but this is the first reported interest in him since free agency got underway back in March.
In 2015, Allen appeared in 13 games for the Steelers and recorded 79 tackles, four sacks, an interception, two forced fumbles and eight pass defenses.