Mudasiru v. Onyearu [2013] 7 NWLR (Pt. 1354) 419 at 446, paras. F-H, per Danjuma, JCA:

“Parties may be joined in a suit at any stage including the stage of execution. It is, therefore, not correct that after judgment, a party may not be joined. It can be done even during an appeal; that is why we have the notice of appeal as an interested party by leave to appeal. This has a constitutional enablement”.

Notes:

The courts are always open to any person who have an interest in a matter. However, it must be noted that such persons must take steps at the earliest opportunity to join the action. This is because, if there is any evidence of indolence or act of standing-by on the part of the party seeking to be joined, the application for joinder might likely be refused.