Chris Wilder says he is happy with the strength in depth and options within his squad.
The Blades boss was speaking for the first time since the closure of the summer transfer window, on the eve of United's trip to Gillingham.
Wilder has singed 12 players since being appointed in March, the last of which saw defenders Ethan Ebanks-Landell and Daniel Lafferty join from Wolves and Burnley respectively and the Gaffer is 'very content' with the make-up of his squad.
He remarked: "Daniel will compete for the left-back spot and offers genuine competition for places in that area.
"We got a fantastic financial deal for him and he is an international footballer, with a very good CV.
"He has played in the Championship and is a good age. He makes us better in that position.
"We want a balanced squad and options in all positions, nobody is untouchable and we need different types of players in certain areas."
Wilder added: "We have now got four really good centre-halves at the club now, Jake Wright was fantastic on his debut and like with the left-back position, we now have competition for places having not had a senior centre-half on the books when we arrived.
"Both Ethan and Daniel both have good pedigrees and both will make us stronger. The lads are good fits, now they have to perform consistently when they have an opportunity."
"We've done our homework on Ethan, he's a competitor and a leader and despite his age he has good experience.
"I'm very content that we've done a lot of good business throughout the window. We've got good deals for those that have departed and we've recruited well, its chalk and cheese from when I arrived and we're in budget."