Results from the Veterans Committee vote will be revealed at 1 p.m. ET on MLB.com on Monday from baseball's Winter Meetings in Las Vegas.
Allen, 66, broke in with the Phillies and had two stints with them. He also played for the Cardinals, Dodgers, White Sox and Athletics. A right-handed hitter, Allen came up as a third baseman and also played first base. He finished his career with a .292 batting average, 351 homers and 1,119 RBIs. A seven-time All-Star, Allen twice led the American League in homers and was known for his mammoth drives.
One memorable drive by Allen that cleared the roof in left-center at Philadelphia's Connie Mack Stadium caused fellow slugger Willie Stargell to marvel at the power Allen could generate.
Stargell quipped that when Allen hit a homer, there's no souvenir.
Allen burst into prominence after having had a September callup with the Phils to acclimate himself to the Majors in '63. In 1964, Allen led the National League in runs (125), triples (13), extra-base hits (80) and total bases (352). He finished in the top five in batting average (.318), slugging percentage (.557), hits (201) and doubles (38).
Allen moved on to the Cardinals in 1970 and entertained fans with his extraordinary power long before Mark McGwire came to St. Louis with his home run hoopla.
After a brief stop in Los Angeles, Allen found contentment and great success playing for the White Sox and manager Chuck Tanner in '72. Tanner decided to play Allen exclusively at first base, which allowed Allen to relax and concentrate on hitting. Allen responded with a league-leading 37 homers in his MVP season. He also led the league in RBIs (113), walks (99) and slugging percentage (.603).
Allen's MVP season included a "first" that qualifies as an excellent trivia subject.
On July 31, 1972, Allen became the first player in baseball's modern era to hit two inside-the-park homers in one game in an 8-1 victory over Minnesota. Both homers came off Bert Blyleven at Minnesota's Metropolitan Stadium.
Allen had a unique personality and was willing to give his special slant on a variety of subjects.
At a time when artificial turf was in vogue around the Major Leagues, Allen made it clear he preferred to play on grass.
"If a horse won't eat it, I don't want to play on it," Allen said.
Whether on grass or turf, Allen could always hit. Now, he's got a chance to use that 44-ounce bat as a springboard to the Hall of Fame.