Christine Ohuruogu is refusing to panic despite what has been a less than impressive start to her summer campaign which continued as she finished fourth in the 400 metres in Friday night's IAAF Diamond League meeting in Oslo.

The Olympic champion had no answer to the powerful pace of Botswana's Amantle Montsho who, matching her season's best of 50.34 seconds, scored a convincing win in the Bislett Stadium.

But the 26-year-old Londoner, although producing a strong finish in the home straight, was also well off the pace which carried Novlene Williams-Mills and Debbie Dunn to the podium places ahead of her.

Ohuruogu, whose major target is winning the European Championships in Barcelona next month, is adamant she will be in top form by then.

Ohuruogu, who improved a position on her DL placing in Doha three weeks ago and clocked 50.98secs, said: "It's going to take a while for things to settle down with me and get my rhythm going again.

"In Doha I went off too fast and here I tried not to but I then went off far too slowly. It will be okay - I'm just doing a lot of things in training differently."

Mark Lewis-Francis, on the comeback trail after injury, failed to make the 100m final from a heat won by Asafa Powell.

The former Olympic 4x100m gold medallist finished in a poor time of 10.24secs which will rule him out of claiming the 100m slot for the Euro Team Championships which will be announced this week.

Powell was denied what would have been his fastest legal time for almost two years as his 9.72secs victory in the final was aided by a wind just a tenth of a second over the permitted limit.

But the Jamaican said: "I like the feeling to see 9.72 on the scoreboard.

"I had a pretty comfortable race tonight. It was a good start, a good finish and I'm ready to meet anybody now."