Sheffield United have completed the signing of defenders Jayden Bogle and Max Lowe from Derby County, as well as a loan move for Chelsea’s Ethan Ampadu.
English full-backs Bogle, 20, and Lowe, 23, join Chris Wilder’s side on four-year deals for undisclosed fees.
Wales international Ampadu, 19, who has made 13 appearances for his country, joins the Blades on a season-long loan.
BBC Radio Sheffield understands United also hope to sign West Brom and Scotland winger Oliver Burke, 23.
It is believed they hope to use Republic of Ireland striker Callum Robinson, 25, in a swap deal for Burke.
Chelsea defender Ampadu spent last season on loan at German side RB Leipzig but was limited to seven appearances.
On Ampadu, manager Wilder said: “Ethan is an outstanding young player for Chelsea, and we’ve worked really hard to get his signature for the season.
“We need to thank Frank Lampard and the people at Chelsea for helping making this happen. We’ve got a good relationship with them and they know we’re going to take good care of him.”
On the permanent signings of England youth internationals Bogle and Lowe, manager Wilder added: “I wanted to bring some young players in who will provide competition for places.
“It was important we got the right characters, the right type of players, ones who are athletic and technically very good.”
Sheffield United have already signed two goalkeepers this summer – Aaron Ramsdale from Bournemouth for £18.5m and Wes Foderingham on a free transfer from Rangers.
The Blades host Wolves in their Premier League opener on 14 September.
Find all the latest football transfers on our dedicated page.
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