Nemanja Vidic believes it is not good for Manchester United's confidence to lose Edwin van der Sar.
The United goalkeeper will miss Tuesday's UEFA Champions League clash with Roma after sustaining a toe injury in Saturday's 1-0 win over Birmingham.
Van der Sar was replaced by Tomasz Kuszczak in the United goal at half-time against the Blues and the Polish shot-stopper will continue to deputise on Tuesday.
Vidic also sat out United's training session on Monday along with fellow defender Wes Brown, but it is only thought to be a precautionary measure after the pair collected knocks against Birmingham.
The Serb says Van der Sar will be a big loss to United, but he also supports the abilities of Kuszczak.
"Edwin gives us a lot of confidence at the back so it's never good to lose him," Vidic told MUTV.
"But Tomasz did very well in the second half at Birmingham. He's a good goalkeeper and we weren't worried when he came off the bench."
Vidic also insists he is not concerned by United's run of single goal victories because he is fully focused on winning.
United have recorded five 1-0 wins already this season, but Vidic insists it is the victory that is the all important factor.
"We're delighted as long as we win," Vidic added. "It's always important we keep a clean sheet, especially when we only score once."