Chris Wilder has already been active in the transfer market this summer, preparing his Sheffield United side for their first Championship campaign since 2011, however, the Blades’ summer recruitment does not seem to be over, with plenty more arrivals expected in South Yorkshire.

Ched Evans, Nathan Thomas and Enda Stevens have all been brought to Bramall Lane already this summer, with Wilder also keen on Charlton Athletics’ Ricky Holmes.

Wilder has already missed out on one target, the experienced Ryan Bennett, who opted to join Wolverhampton Wanderers, following his release from Norwich City.

The interest in Bennett showed Wilder is looking to add experience to his squad ahead of their Championship return, and another central defender he could look to bring to Bramall Lane is Derby County’s Jason Shackell, who is entering the final 12-months of his contract with the Rams.

Gary Rowett has opted to sign Curtis Davies to add to his central defensive options, which already include Shackell, Richard Keogh and Alex Pearce, with another defender reportedly on Derby’s radar this summer.

Players may be heading for the exit door at the Pride Park Stadium, and the Blades should move to bring Shackell to Bramall Lane, where the 33-year old’s experience could prove vital for Wilder’s side.

Last season in the Championship, Shackell made just eight appearances, although injury did end the defender’s season prematurely, but 12-months earlier, the 33-year old was a rock for the Rams, making 50 appearances across all competitions and helping Derby to a play-off appearance.

Wilder is looking to bolster his squad ahead of the Blades’ Championship return and he must bring some experience to his squad. Shackell would serve as an excellent short-term option for the Blades, as they look to establish themselves back in the second-tier.