Calum played his part in Coventry's win over the Hammers on Bank Holiday Monday, and didn't let his impending move to Spurs - announced immediately after the game - cloud his performance.
In fact, he even thought he had scored against West Ham in the first half, only to have the 'goal' chalked off for an infringement.
But he has no qualms about joining West Ham for at least three months from his new club in a move which should benefit all parties.
That he gave such a professional performance knowing he was about to leave speaks volumes about Calum's character - something, as much as his undoubted ability, that attracted Alan Pardew to him.
"I sort of knew that this might have been on the cards but Coventry wanted me to play, I was still a Coventry player, and I had a job to do there," he says.
"It was a bit strange and difficult but I was under contract to them and I had to fulfil that.
"It is finished now, we are on equal points, and hopefully West Ham can kick on more than Coventry do.
"I am delighted to be at Upton Park and it was my decision to come; I could have stayed at Tottenham and played reserve team football but I have been playing in this division for a couple of seasons, I know it is a tough league, and I have chosen to come here because I want to play first team football - which beats playing in the reserves.
"Obviously West Ham is a massive club and this gives me a good opportunity.
"I could have gone back to Coventry on loan but my thoughts and Tottenham's behind the move were that I can move my family down here, get settled in, and just concentrate on my football rather than to-ing and fro-ing from Coventry to London.
"I am away this afternoon looking for somewhere to rent for six months while I find an area I want to live in; hopefully the quicker I get settled off the pitch it will help me on the pitch."
As for his ambitions while at Upton Park, he says:
"I just want to play well, get the right results, and get West Ham up the table because after the first six games it looks as if it is a quite open league.
"Hopefully if we can get that consistency level we can do well."
He knows Nigel Reo-Coker and Anton Ferdinand personally and adds:
"I was away with Nigel and Anton with the U21s and I have obviously played against most of the boys before, so it is just about getting to know them - hopefully I can settle in quickly and find my feet."
He is particularly keen to play with Teddy Sheringham and says:
"The experience he has of playing at the top level means he can guide the younger members of the team to do well."
Calum is under no illusions about the decision he has made to, as it were, leave the 'comfort zone' of gently bedding in at Spurs and he explains:
"It is a tough league; when you wake up on a Saturday morning you know, as a centre half, you are going to get bashed all over the place because it is a physical division.
"If we can match that I think we have the quality to get the right results.
"It is three months initially and depending on what happens injury-wise at Tottenham hopefully I can settle here for the season and then maybe go back next season."
And a final word on that Coventry win over West Ham at Highfield Road?
"For me, I thought West Ham created a few chances but Coventry seemed to raise their game that day and scored two cracking goals that the keeper had no chance with and maybe 2-1 was a bit lucky, really."