McLaren boss Ron Dennis has praised the maturity of Fernando Alonso following McLaren's troubled 2015 campaign, in which it slumped to ninth in the standings.
Dennis and Alonso endured an acrimonious relationship in 2007 but put aside differences to reunite in 2015, amid Honda's return as McLaren's power unit supplier.
Alonso could muster only 11 points in his first year back with McLaren but was praised by Dennis for his approach.
"Fernando is as hard-working as he is talented, be in no doubt of that," he explained to the official F1 website.
"He’s matured enormously since he last drove for us, eight years ago, and he’s now one of the most complete drivers I’ve ever had the privilege of working with.
"He has what I often refer to as the four e’s that all racing drivers should aspire to cultivate: energy, enthusiasm, expertise and experience."
Dennis once more emphasised that Alonso will remain with the outfit until at least the end of 2017.
"Fernando’s contract is of three years’ duration - no performance clauses, no nothing," he said.
"He always knew that 2015 would be a learning year. He knows equally well that, together with Honda, we’ll make big improvements. So he joined us with open eyes.
"Together with the expertise and experience he’s cultivated over the past 15 years spent racing in Formula One, he still bristles with energy and enthusiasm.
"He’s had better years than 2015, obviously; but he knows that great years lie ahead of him, with McLaren-Honda."