The former Middlesbrough boss admitted that some of his players looked rusty on the night, but insisted that they could have won the match.
"We've had three days' hard work and we were one pass away from another three or four goals. Some of these guys haven't played in weeks and I think you could see that in a few of the final balls," he told BBC Sport.
"I've got a squad in there where every one of them wants the others to do well."
The Scots were denied victory by a 90th-minute equaliser from substitute Nwofor Uche.