UK Athletics head coach Charles van Commenee believes 5000m world champion Mo Farah is "a complete athlete".
Farah, 28, won Saturday's 1500m event in Glasgow after outsprinting Augustine Choge - the fastest man in the world over the distance indoors in 2011.
"In the 2011 World Championships 10km, he was taken by surprise but he is warned now - he's a complete athlete," said Van Commenee.
"Mo at the moment is the number one, but there are a few who can take over."
Farah had only arrived back in Britain two days before the race, having spent five weeks' altitude training in Kenya.
His victory at the weekend helped Great Britain and Northern Ireland seal victory in the five-team event.
"We'll remember that race for a while," added Dutchman Van Commenee. "It was fantastic.
"Beating the world leader is quite special. It's not his distance, so it's very pleasing to see the world champion over 5000m beat the best athlete over 1500m.
"That's very encouraging."
Mark Lewis-Francis (60m), Danny Talbot (200m), Margaret Adeoye (200m), Joe Thomas (800m), Jeanette Kwakye (60m) and Yamile Aldama (triple jump) also claimed victory at Kelvin Hall.
"It was very pleasing to see we had a new name like Margaret," said Van Commenee.
"Danny and Joe are not new but they made a mark here.
"I was very impressed with Joe, the way he ran. That makes him a strong candidate to make the Olympic team and world indoors.
"Kwakye coming out with 7.26 seconds. In her best year, she did 7.24 in her first race so that promises a lot."