Craig Mitchelldyer/Portland Timbers

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The Portland Timbers signed 5-year-old goalkeeper Derrick Tellez to a one-game contract ahead of Sunday's home match against Orlando City SC in a partnership with Make-A-Wish Oregon as part of Tellez's dream to be a first-team player with the Timbers.

Derrick, who is currently battling a cancerous brain tumor, got his first taste of first-team training as he arrived in a limousine ready to go through drills and get his game right for the Timbers showdown with Orlando City on Sunday.

In case you missed all the best moments on social media, here's a detailed look at Derrick's first training session with the Timbers through photos, videos and more.

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Our new #100 has arrived! [?] Follow on Snapchat & Insta (timbersfc) to see Derrick Tellez's first day at training. [?][?]#WelcomeDerrick #RCTID pic.twitter.com/Nb89CjWlgh -- Portland Timbers (@TimbersFC) September 22, 2017

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Craig Mitchelldyer/Portland Timbers

Before taking the field, Derrick needed to sign his professional contract with the team. Here he is with GM Gavin Wilkinson (left) and head coach Caleb Porter (right).

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Craig Mitchelldyer/Portland Timbers

The Timbers made sure that when Derrick arrived, he had his place in the locker room. Here's a look at his name plate.

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Craig Mitchelldyer/Portland Timbers

Derrick had a hard time getting his boots on, but lucky for him that he shares a locker with Lawrence Olum, who was more than happy to help his new teammate get laced up before taking the pitch.

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Craig Mitchelldyer/Portland Timbers

Derrick, donning his No. 100 jersey, made his way to the field alongside fellow keepers Jeff Attinella and Jake Gleeson.

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Craig Mitchelldyer/Portland Timbers

Before he can take the field, coach Caleb Porter and the team huddled around to welcome Derrick to training.

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Craig Mitchelldyer/Portland Timbers

Time for the team photo!

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And then it was on to the training ground for Derrick alongside his new teammates...

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Craig Mitchelldyer/Portland Timbers

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Craig Mitchelldyer/Portland Timbers

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Craig Mitchelldyer/Portland Timbers

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