Sunderland have allowed Wickham to extend his loan deal at Hillsborough until January 29 after the striker initially joined at the start of November.
He has impressed for the Owls, scoring six goals in eight games including the equaliser in the 1-1 draw with Charlton on Sunday.
Loovens joined Wednesday on a month-by-month basis in early December but the Dutch defender has signed a contract extension through to the end of the season.
The former Cardiff and Celtic centre-back has so far made five appearances, during which the Owls have conceded only three goals and lost just once.
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