Former Telecom Minister A Raja is likely to appear before CBI officials on Friday for questioning in connection with alleged irregularities in the allocation of 2G spectrum . Earlier, CBI officials have sent a notice to Raja to appear before it for questioning.Mr Raja, who flew to Delhi on Wednesday night from Chennai, had told reporters that he would cooperate with CBI in the probe.The Supreme Court has also asked CBI and the Enforcement Directorate to submit status reports on their investigations into the 2G scam to it by February 10, when the case will come up for hearing.Corporate lobbyist Niira Radia and former Telecom Regulatory Authority of India (TRAI) chief Pradip Baijal was earlier this week questioned by the CBI.