Openreach has responded to calls from politicians to invest more heavily in a full-fibre broadband rollout.
The organisation recently pledged to upgrade three million homes and businesses to full-fibre broadband technology by the end of 2020.
However, Chairman Mike McTighe has acknowledged this has not stopped criticism that it should be investing more.
Speaking to the Financial Times, he insisted Openreach is not being deprived of adequate funding by its parent company BT.
Instead, he stressed it has to deal with a number of more immediate issues before committing to rolling out full-fibre on a wider scale.
For instance, Mr McTighe said Openreach needs to make sure it has access to the skills base required to fund major civil engineering projects.
"The worst thing for the Openreach board to do is fall flat on our face on the first big thing we try to do," he commented.
"Some commentators would just throw money at us but I’m not feeling financially constrained."
Mr McTighe added that Openreach is aiming to connect one million full-fibre lines a year.
This comes shortly after an Openreach spokesperson told BBC News that no other organisation is investing more than it is in improving broadband services throughout Britain.
The official noted that it has spent £11 billion on upgrading its network over the last decade, while 95 per cent of the country can now order a superfast broadband service.