Chelsea legend Lampard clashed on the touchline with Pompey manager John Mousinho in the first-half.
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Coventry won on the night to stay top of the Championship table. However, with scores locked at 0-0 before the break, the two managers clashed over a penalty call for Portsmouth that was waved away.
The argument between the pair went on for some time, with the fourth official having to eventually get between the two managers to ease the tension.
Coventry won 2-1 on the night thanks to a double from Brandon Thomas-Asante.