We are hopeful that people who have come as replacements would step up to the occasion and perform," he said.
Delving on Yuvraj Singh's
injury-riddled form, Dhoni said, "He bats at number four and the individual he is, he can easily play the big shots. There aren't enough grounds in the world that are big enough for him not to clear."
Please explain to me the emboldened parts.
Though I guess "delving on" means "commenting on".
Injury-riddled means "poor form".
Source :
http://beta.thehindu.com/sport/cricket/article415708.ece