I would like to remove the colour only for the Author Name in the citation created using natbib + bibliography for Springer (svjour3) journal manuscript.
\documentclass[12pt,a4paper,referee]{svjour3}
\smartqed
\usepackage{mathptmx}
\usepackage{float}
\usepackage{url}
\usepackage[colorlinks=true,linkcolor=blue,citecolor=blue,urlcolor=blue]{hyperref}
\usepackage{etoolbox}
\usepackage{cite}
\usepackage{natbib}
\begin{document}
\citep{kannan2013} ....... \\
\citet{kannan2013}
\begin{thebibliography}{300}
\bibitem[Kannan and Santhi(2013)]{kannan2013} Kannan, M. R., \& Santhi, M. H. (2013). Constructability Assessment of Climbing Formwork Systems using Building Information Modeling. \textit{Procedia Engineering}, 64, 1129-1138.
\end{thebibliography}
\end{document}

\makeatletterand ending with\makeatotherinto your document's preamble, right after\usepackage{etoolbox}. Incidentally, you should load bothnatbibandetoolboxbefore, not after,urlandhyperref. – Mico Apr 24 '18 at 13:10citeand thenatbibcitation management packages. – Mico Apr 24 '18 at 13:54