According to www.thebaseballcube.com
here are the transactions and the exact date periods that John Wetteland was with the Reds. So I guess it is very very possible he could have been on the roster during this time period although it appears that he never even so much as put on a Reds affiliate minor league uniform which is very disappointing in and of itself in my opinion...
November 27, 1991 Traded by Los Angeles Dodgers with Tim Belcher to Cincinnati Reds for Kip Gross and Eric Davis. Cin: Bob Sr. Quinn
La: Fred Claire
December 11, 1991 Traded by Cincinnati Reds with Bill Risley to Montreal Expos for Willie Greene, Scott Ruskin and Dave Martinez. Cin: Bob Sr. Quinn
Mtl: Dave Dombrowski
Geez....with us for not even one calendar month!!!!