Derby defender Shaun Barker is poised for knee surgery.
The Championship club confirmed last week Barker was to undergo an operation to have his knee 'washed out' and the 27-year-old will go under the knife on Thursday.
It is a proactive step by by boss Nigel Clough to ensure Barker will be ready for the start of pre-season training at the end of June. In a similar step, winger David Martin will have an ankle operation at the start of next week.
"Both are routine operations and would normally have them out of action for four to six weeks," Clough told the club's official website.
"Both will have a week or two prior to pre-season to do some work and get themselves in a good shape ahead of the hard work that pre-season brings."
Forwards Steve Davies and Rob Hulse underwent surgery on their respective ankle and hernia problems at the end of last month and will be available for pre-season.
Midfielder Stephen Pearson had a successful knee operation last week but will miss pre-season and the first month or so of the next campaign as his recovery is expected to take around four months.
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