OPINION

Alex Lee Lineberger pled guilty to conspiracy to possess with intent to distribute cocaine base, 21 U.S.C. § 846 (2000). The Government filed an information pursuant to 21 U.S.C. § 851(a) (2000) seeking to enhance Lineberger’s statutory maximum sentence based on three prior felony drug convictions. At sentencing the district court inquired into the validity of each conviction and Lineberger affirmed each conviction. Lineberger was not informed that if he did not raise a challenge to a prior conviction before his sentence was imposed, any such challenge would be waived. 21 U.S.C. § 851(b) (2000). Counsel for Lineberger has filed a brief in accordance with Anders v. California, 386 U.S. 738, 87 S.Ct. 1396, 18 L.Ed.2d 493 (1967), raising issues relating to ineffective assistance of counsel and the district court’s failure to conduct the colloquy required by § 851(b), but stating that there are no meritorious issues for appeal. Lineberger was informed of his right to file a pro se supplemental brief but has failed to do so. The Government declined to file a brief.

First, Lineberger asserts trial counsel was ineffective without offering specific grounds. Claims of ineffective assistance of counsel are not cognizable on direct appeal unless counsel’s ineffectiveness plainly appears on the face of the record. United States v. DeFusco, 949 F.2d 114, 120-21 (4th Cir. 1991). We have reviewed the record for error and have found no clear ineffective assistance by Lineberger’s counsel.

Second, Lineberger contends the district court erred by its failure to inform him that his failure to challenge the convictions relied on to enhance his sentence under § 851(a) waived further review of those convictions. The district court erred by its failure to completely comply with § 851(b), and the error was plain. See United States v. Ellis, 326 F.3d 593, 598-599 (4th Cir. 2003) (published). However, because Lineberger affirmed those prior convictions, such error did not affect Lineberger’s substantial rights. Id. at 598-599.

We have reviewed the record in accordance with the requirements of Anders and find no meritorious issues for appeal. *486 We therefore affirm Lineberger’s conviction and sentence. This court requires that counsel inform her client, in writing, of his right to petition the Supreme Court of the United States for further review. If the client requests that a petition be filed, but counsel believes that such a petition would be frivolous, then counsel may move in this court for leave to withdraw from representation. Counsel’s motion must state that a copy thereof was served on the client.

We dispense with oral argument because the facts and legal contentions are adequately presented in the materials before the court and argument would not aid the decisional process.

AFFIRMED.