'KG' netted on 50 minutes for The Eagles against Nottingham Forest, but was stretchered off after a clash of heads 16 minutes later and taken hospital for observation.
He tweeted on Wednesday morning that he was feeling fine though and could even make the home fixture against Cardiff City on Saturday.
"Thank God nothing serious...thank you all for the kind messages and hope will be fit for Saturday .....CPFC," he said on Twitter.
Dikgacoi had headed home a corner to continue his remarkable scoring run this season, having also netted the winner in the victory over Charlton Athletic last weekend.
Kgosi Ntlhe was back in the Peterborough United line-up for their 2-1 loss at home to Bristol City. Posh have now lost all six League matches this season and manager Darren Ferguson must be on the brink of the sack.
In League One, Dean Furman skippered Oldham Athletic as they were held 1-1 at home by Scunthorpe United.
In the UEFA Champions League, Thulani Serero was an unused substitute for Ajax Amsterdam as they lost 1-0 away at Borussia Dortmund.