A clutch of Premiership managers - including Charlton's Alan Curbishley and Everton's David Moyes - were at the Millennium Stadium on Wednesday to watch the Bluebirds striker score a hat-trick in Wales' 4-0 destruction of Scotland.
Lawrence knows Earnshaw - who has already bagged 23 goals for City this term - will have attracted the attention of leading clubs with his Wales wonder show.
And the City chief said summer bids for the Ninian Park hotshot are inevitable if he carries on scoring this season.
"I said during last month's transfer window that Earnie wasn't ready for the Premier League," said the City manager, who was also at the Wales v Scotland game.
Robert Earnshaw last night admitted he was aware of the increasingly realistic prospect of a summer move to the Premiership but was more intent upon establishing himself in the Wales side for the World Cup qualifying campaign.
The 22-year-old Cardiff City striker scored his country's first hat-trick in 12 years in Wednesday's rout of Scotland at the Millennium Stadium, seizing upon the absence of John Hartson and Craig Bellamy to swell his international goal tally to a staggering six in only 10 matches.
"I know I can score goals at whatever level," said Earnshaw.
Robert Earnshaw's splendid hat-trick, which reinvigorated Wales and shattered Scotland on Wednesday night, could not have been better timed for his international manager, Mark Hughes.
With first choice strikers Craig Bellamy and John Hartson ruled out of the friendly, Hughes not only needed somebody to step confidently into the breach but he wanted a considerable boost in morale after his team's narrow and controversial failure to reach the European Championship finals and a wait of a year for a victory.
"Robert Earnshaw - remember the name," shouted the man leaning out of a taxi window, as the car swung towards the Central Station and midnight prepared to chime in the Welsh capital. The men in kilts barely glanced up, although the man who manages their football team, Berti Vogts, is unlikely to forget it.
Vogts had first watched the 22-year-old Earnshaw - described by the Wales manager, Mark Hughes, as being "electric all night" - two years ago when his goal had given Wales a stunning victory over a German side which a little over a month later would find itself in another World Cup final. The hat-trick he scored on Wednesday might well be enough to persuade the Scottish Football Association that the experiment of employing a German manager at a salary far greater than that paid to his predecessor, Craig Brown, should be discontinued.
WALES no longer have a secret weapon up their sleeve before a World Cup qualifying campaign in which they look forward to renewing hostilities with England later this year. But, as Scotland’s defenders found out on Wednesday, identifying and stopping the threat of Robert Earnshaw are two different things.
The Cardiff City forward scored a hat-trick in Wales’s 4-0 victory, their biggest in 103 meetings with Scotland, and will doubtless feature prominently in the scouting bulletin that arrives on Sven-Göran Eriksson’s desk this morning.