Danny Wilson was delighted to see his two substitutions change the game at Walsall on Saturday.
After a lacklustre first-half showing at the Banks's Stadium, Wilson introduced Chris Porter in place of Dave Kitson at the start of the second half and on the hour Callum McFadzean replaced Barry Robson.
The Blades boss reserved special praise for the duo after Porter's scrambled effort rescued a point to keep the Blades in the hunt for a top two finish.
He commented: "The manner of how we conceded typified our first half display, we weren't tight enough, we let the space be an enemy to us and we just looked totally out of it.
"The substitutes totally changed the game and I am particularly delighted for Chris (Porter), he showed what he has in his locker. Callum (McFadzean) has a direct style that puts the opposition on the back foot; he can have a big role to play in the weeks ahead.
"The loan move did have an impact on Chris, the grass isn't always greener elsewhere and every player has to give every drop of blood and sweat to get Sheffield United back to the Championship."
Looking ahead to the forthcoming hectic schedule, which sees United in action twice a week until the end of the season, the manager, who played Matt Hill at right back against the Saddlers, added:
"We have got to manage the players properly to maximise what we have available because there are going to be times when lads need a rest and others will have to step up to the plate.
"Matt (Hill) was exceptional in an unfamiliar position, but his defensive expertise was crucial against the likes of Jamie (Paterson)."