Gambia may be faced with military intervention by regional forces.
This is as a result of the decision by Yahya Jammeh not to step down.
Mr Jammeh had been told to leave office by the end of Wednesday and hand over to last month’s election winner, Adama Barrow, who is currently in Senegal.
Jammeh, lost a December 1 presidential vote to Adama Barrow.
He has refused to leave office despite international pressure and a threat by leaders of the Economic Community of West African States, or ECOWAS, to enforce his election defeat.
Barrow pledged to go ahead with his inauguration on Thursday on Gambian soil.
He had fled to Senegal earlier in the week
According to Al Jazeera’s Ahmed Idris, reporting from the Nigerian capital Abuja, said that deployment involved air, naval and ground troops.
“A ship of the Nigerian navy is off the coast of Ghana on the way to Gambia, and there are reports that Ghana may also be contributing to the troops’ deployment to Gambia, in addition to Senegal,” he said.
Senegal has moved troops towards the Gambian border in an effort to force President Yahya Jammeh to accept electoral defeat and step down.
Senegal is leading the operation, which is supported by Nigeria and other states in the region.
Mr Jammeh has ruled The Gambia since taking power in a coup in 1994.