Asante Kotoko coach David Duncan has advised Chelsea defender Baba Rahman to improve his defensive skills.

Duncan praised the Ghana international for his offensive forays but was quick to point out his weakness.

Rahman was introduced after 38 minutes in Saturday’s 5-1 win over Newcastle at Stamford Bridge to replace injured captain John Terry.

He gave a good account of himself but Duncan was not overly enthused.

Duncan later tweeted: “Baba Rahman exhibits enviable 'positive mental attitude', but must improve defensively at this level.”