The centre-half has yet to miss a Championship match this campaign but he suffered a groin injury during the draw at Swansea in midweek, with the problem forcing him off the field midway through the second half.
The Rams, who will guarantee themselves a play-off spot with victory, are assessing the extent of the damage ahead of Sunday's crucial televised clash.
Lampard is short of cover in central defence and could once ask midfielder George Evans to deputise should Keogh miss out.
Matt Phillips could be involved from the start when West Brom visit Pride Park.
The influential winger has been used as a substitute in each of the Baggies' last four matches following his return from an ankle injury and he could be named in James Shan's XI for Sunday's game after being given an extra day to get up to speed.
Fourth-placed Albion are assured of a play-off berth and could grab third spot if they beat Derby and Leeds lose to basement club Ipswich.
Midfielder Gareth Barry remains sidelined.
*odds correct at time of posting and are subject to change
Derby County v West Brom
Paddy Power pre-match odds: Derby 5/6, Draw 11/4, West Brom 11/4*
The centre-half has yet to miss a Championship match this campaign but he suffered a groin injury during the draw at Swansea in midweek, with the problem forcing him off the field midway through the second half.
The Rams, who will guarantee themselves a play-off spot with victory, are assessing the extent of the damage ahead of Sunday's crucial televised clash.
Lampard is short of cover in central defence and could once ask midfielder George Evans to deputise should Keogh miss out.
Matt Phillips could be involved from the start when West Brom visit Pride Park.
The influential winger has been used as a substitute in each of the Baggies' last four matches following his return from an ankle injury and he could be named in James Shan's XI for Sunday's game after being given an extra day to get up to speed.
Fourth-placed Albion are assured of a play-off berth and could grab third spot if they beat Derby and Leeds lose to basement club Ipswich.
Midfielder Gareth Barry remains sidelined.
*odds correct at time of posting and are subject to change
Head to Head Comparison
Derby County - Last 5 Matches
West Bromwich Albion - Last 5 Matches