Paul could help with the Reds' struggling offense. He batted .332 in 66 games with nine homers and 48 RBIs between Louisville and Triple-A Syracuse.
Votto had surgery on Tuesday to repair torn cartilage in his left knee and is expected to be sidelined for three to four weeks. He's the Reds' top hitter, batting .342 and leading the NL in doubles, walks and extra-base hits.
The Reds optioned right-hander Todd Redmond back to Louisville after a one-day stay in Cincinnati. The Reds called him up before Tuesday's 4-0 win over Arizona because they were concerned that starter Johnny Cueto would have trouble with a blister on his pitching hand.