Leicester coach Richard Cockerill was left to rue the "daft errors" made by his team after Saturday afternoon's 23-11 LV= Cup defeat to bitter rivals Northampton at Franklin Gardens.
Cockerill was nevertheless pleased with his side's overall display, but admitted mistakes had proved costly.
"We acquitted ourselves very well," he said. "In the first half we controlled matters but with bits of ball they scored two soft tries."
He added: "It was disappointing to do this but we scored a great try thanks to Lucas Amorosino - but those daft errors in defence cost us.
"We should have made more of our opportunities and in the second half we should have set up a grandstand finish had we scored again but we didn't take our chances at that stage."
Paul Diggin and Alan Dickens crossed in the first half to put Saints in the ascendancy, with Billy Twelvetrees responding in kind for the Tigers.
Amorosino had an exceptional game for the visitors, including a 60-metre dash for Twelvetrees' score, but was helped off the field within a leg injury after 59 minutes.
Cockerill said: "Lucas was outstanding. The injury he sustained was hopefully not too serious. It seems to be a bang on the knee but he will need a scan on Monday."