His time by the Thames has been plagued by injuries and suspension, after being sent-off just 41 minutes into his Premier League debut against West Ham back in October, then suffering ankle ligament damage early in the new year.
South Africa international Dikgacoi said: "I'm disappointed with my first season but I have got a couple of excuses, the injuries and suspension.
"I still have to prove myself. Everyone will be watching so I just want to do my best.
"My main aim next season is to get a regular starting spot. I've just got to work hard."