Milan Mandaric is banking on the Owls bouncing back from the double blow of losing Connor Wickham and being knocked out of the FA Cup.
Wickham’s loan move to Leeds from Sunderland comes after the Owls had hoped to re-sign him.
But Mandaric pointed out that a revival in the League has been maintained since Wickham departed in January - and the chairman hopes that the final 15 games can keep it going.
He described the defeat by Charlton as a bitter pill to swallow - “for me and all our supporters.”
And he told The Star: “We let ourselves and the supporters down. It was one of those things, You have to accept it, With the way the team played in the first half, I did not recognise them. In my 15 years in England, I never saw my team at Wembley; I thought this was my chance, and a chance for our faithful fans.
“But we go on. We have to try to win as many points as possible. It is important that we stabilise ourselves in the Championship and give ourselves a springboard for next season.
“Yes, we were interested in Connor, We tried to get hold of the people at Sunderland to see what was happening with him; then we heard from his agent that the club had done a deal with Leeds.
“It’s very disappointing. He helped us and we appreciate it, but we kept winning games after he was gone. It would be totally wrong if we based all our team on one player.”
He said the Owls will probably try to extend Leon Best’s loan when it ends in mid-March.